new bibtex package sort-by-letters

git-svn-id: svn://tug.org/texlive/trunk@1773 c570f23f-e606-0410-a88d-b1316a301751

12 files changed, 9259 insertions, 1 deletions

diff --git a/Build/tools/tpm-ctan-check b/Build/tools/tpm-ctan-check
index d994921b726..e74a6124b48 100755
--- a/Build/tools/tpm-ctan-check
+++ b/Build/tools/tpm-ctan-check
@@ -77,7 +77,8 @@ sub main
          "pst-3d", "pst-barcode", "pst-blur", "pst-eucl",
          "pst-labo", "pst-lens", "pst-osci", "pst-pdgr", "pst-slpe",
        "sciposter", "sectionbox", "sectsty", "seminar", "semioneside",
-         "setspace", "sf298", "sides", "skaknew", "sparklines", "spotcolor",
+         "setspace", "sf298", "sides", "skaknew", "sort-by-letters",
+         "sparklines", "spotcolor",
          "sttools", "struktex", "subfig", "sudoku", "svn-multi", "svninfo",
        "t-angles", "tabulary", "talk", "tamethebeast", "tex-refs",
          "texmate", "texshade", 
diff --git a/Master/texmf-dist/bibtex/bst/sort-by-letters/abbrv-letters.bst b/Master/texmf-dist/bibtex/bst/sort-by-letters/abbrv-letters.bst
new file mode 100644
index 00000000000..fd2f514fb9d
--- /dev/null
+++ b/Master/texmf-dist/bibtex/bst/sort-by-letters/abbrv-letters.bst
@@ -0,0 +1,1217 @@
+% BibTeX bibliography style `abbrv-letters'
+%% adapted from standard style `abbrv'
+%% (C) 2006 - Thomas van Oudenhove 
+%% when sorting by letter, write the first letter of author 
+%% or editor - bug with organization...
+
+ENTRY
+  { address
+    author
+    booktitle
+    chapter
+    edition
+    editor
+    howpublished
+    institution
+    journal
+    key
+    month
+    note
+    number
+    organization
+    pages
+    publisher
+    school
+    series
+    title
+    type
+    volume
+    year
+  }
+  {}
+  { label }
+
+INTEGERS { output.state before.all mid.sentence after.sentence after.block }
+
+FUNCTION {init.state.consts}
+{ #0 'before.all :=
+  #1 'mid.sentence :=
+  #2 'after.sentence :=
+  #3 'after.block :=
+}
+
+STRINGS { s t  cur.letter first.letter }
+INTEGERS { first.letter.place first.letter.ascii }
+
+FUNCTION {output.nonnull}
+{ 's :=
+  output.state mid.sentence =
+    { ", " * write$ }
+    { output.state after.block =
+        { add.period$ write$
+          newline$
+          "\newblock " write$
+        }
+        { output.state before.all =
+            'write$
+            { add.period$ " " * write$ }
+          if$
+        }
+      if$
+      mid.sentence 'output.state :=
+    }
+  if$
+  s
+}
+
+FUNCTION {output}
+{ duplicate$ empty$
+    'pop$
+    'output.nonnull
+  if$
+}
+
+FUNCTION {output.check}
+{ 't :=
+  duplicate$ empty$
+    { pop$ "empty " t * " in " * cite$ * warning$ }
+    'output.nonnull
+  if$
+}
+
+FUNCTION {output.letter}
+{ first.letter cur.letter =
+    { skip$ }
+    { newline$
+      "\alphabibitem{" first.letter * "}" * write$
+      newline$ 
+      first.letter 'cur.letter := }
+  if$
+  cur.letter "\" = 
+    { first.letter 'cur.letter := }
+    { skip$ }
+  if$
+}
+
+FUNCTION {output.bibitem}
+{ newline$
+  "\bibitem{" write$
+  cite$ write$
+  "}" write$
+  newline$
+  ""
+  before.all 'output.state :=
+}
+
+FUNCTION {fin.entry}
+{ add.period$
+  write$
+  newline$
+}
+
+FUNCTION {new.block}
+{ output.state before.all =
+    'skip$
+    { after.block 'output.state := }
+  if$
+}
+
+FUNCTION {new.sentence}
+{ output.state after.block =
+    'skip$
+    { output.state before.all =
+        'skip$
+        { after.sentence 'output.state := }
+      if$
+    }
+  if$
+}
+
+FUNCTION {not}
+{   { #0 }
+    { #1 }
+  if$
+}
+
+FUNCTION {and}
+{   'skip$
+    { pop$ #0 }
+  if$
+}
+
+FUNCTION {or}
+{   { pop$ #1 }
+    'skip$
+  if$
+}
+
+FUNCTION {new.block.checka}
+{ empty$
+    'skip$
+    'new.block
+  if$
+}
+
+FUNCTION {new.block.checkb}
+{ empty$
+  swap$ empty$
+  and
+    'skip$
+    'new.block
+  if$
+}
+
+FUNCTION {new.sentence.checka}
+{ empty$
+    'skip$
+    'new.sentence
+  if$
+}
+
+FUNCTION {new.sentence.checkb}
+{ empty$
+  swap$ empty$
+  and
+    'skip$
+    'new.sentence
+  if$
+}
+
+FUNCTION {field.or.null}
+{ duplicate$ empty$
+    { pop$ "" }
+    'skip$
+  if$
+}
+
+FUNCTION {emphasize}
+{ duplicate$ empty$
+    { pop$ "" }
+    { "{\em " swap$ * "}" * }
+  if$
+}
+
+FUNCTION { author.find.first.letter }
+{ author #1 "{vv }{ll }{ff }, {jj }" format.name$ "u" change.case$
+  purify$ first.letter.place #1 substring$ 'first.letter := 
+  first.letter chr.to.int$ 'first.letter.ascii :=
+}
+
+FUNCTION { editor.find.first.letter }
+{ editor #1 "{vv }{ll }{ff }, {jj }" format.name$ "u" change.case$ 
+  purify$ first.letter.place #1 substring$ 'first.letter :=
+  first.letter chr.to.int$ 'first.letter.ascii :=
+}
+
+FUNCTION { organization.find.first.letter }
+{ organization "u" change.case$
+  purify$ first.letter.place #1 substring$ 'first.letter := 
+  first.letter chr.to.int$ 'first.letter.ascii :=
+}
+
+FUNCTION { find.firstletter }
+{ author empty$
+    { editor empty$
+%        { organization empty$
+          { "Nor author, editor neither organization for entry " cite$ * warning$ }
+%          { organization.find.first.letter
+%            { first.letter.ascii #64 > first.letter.ascii #91 < and
+%              first.letter.ascii #96 > first.letter.ascii #123 < and or not }
+%            { first.letter.place #1 + 'first.letter.place :=
+%              organization.find.first.letter }
+%          while$ }
+%          if$ }
+        { editor.find.first.letter
+          { first.letter.ascii #64 > first.letter.ascii #91 < and
+            first.letter.ascii #96 > first.letter.ascii #123 < and or not }
+          { first.letter.place #1 + 'first.letter.place :=
+            editor.find.first.letter }
+        while$
+        }
+      if$
+    }
+    { author.find.first.letter
+      { first.letter.ascii #64 > first.letter.ascii #91 < and
+        first.letter.ascii #96 > first.letter.ascii #123 < and or not }
+      { first.letter.place #1 + 'first.letter.place :=
+        author.find.first.letter }
+    while$
+    }
+  if$
+  #1 'first.letter.place :=
+}
+
+INTEGERS { nameptr namesleft numnames }
+
+FUNCTION {format.names}
+{ 's :=
+  #1 'nameptr :=
+  s num.names$ 'numnames :=
+  numnames 'namesleft :=
+    { namesleft #0 > }
+    { s nameptr "{f.~}{vv~}{ll}{, jj}" format.name$ 't :=
+      nameptr #1 >
+        { namesleft #1 >
+            { ", " * t * }
+            { numnames #2 >
+                { "," * }
+                'skip$
+              if$
+              t "others" =
+                { " et~al." * }
+                { " and " * t * }
+              if$
+            }
+          if$
+        }
+        't
+      if$
+      nameptr #1 + 'nameptr :=
+      namesleft #1 - 'namesleft :=
+    }
+  while$
+}
+
+FUNCTION {format.authors}
+{ author empty$
+    { "" }
+    { author format.names }
+  if$
+}
+
+FUNCTION {format.editors}
+{ editor empty$
+    { "" }
+    { editor format.names
+      editor num.names$ #1 >
+        { ", editors" * }
+        { ", editor" * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.title}
+{ title empty$
+    { "" }
+    { title "t" change.case$ }
+  if$
+}
+
+FUNCTION {n.dashify}
+{ 't :=
+  ""
+    { t empty$ not }
+    { t #1 #1 substring$ "-" =
+        { t #1 #2 substring$ "--" = not
+            { "--" *
+              t #2 global.max$ substring$ 't :=
+            }
+            {   { t #1 #1 substring$ "-" = }
+                { "-" *
+                  t #2 global.max$ substring$ 't :=
+                }
+              while$
+            }
+          if$
+        }
+        { t #1 #1 substring$ *
+          t #2 global.max$ substring$ 't :=
+        }
+      if$
+    }
+  while$
+}
+
+FUNCTION {format.date}
+{ year empty$
+    { month empty$
+        { "" }
+        { "there's a month but no year in " cite$ * warning$
+          month
+        }
+      if$
+    }
+    { month empty$
+        'year
+        { month " " * year * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.btitle}
+{ title emphasize
+}
+
+FUNCTION {tie.or.space.connect}
+{ duplicate$ text.length$ #3 <
+    { "~" }
+    { " " }
+  if$
+  swap$ * *
+}
+
+FUNCTION {either.or.check}
+{ empty$
+    'pop$
+    { "can't use both " swap$ * " fields in " * cite$ * warning$ }
+  if$
+}
+
+FUNCTION {format.bvolume}
+{ volume empty$
+    { "" }
+    { "volume" volume tie.or.space.connect
+      series empty$
+        'skip$
+        { " of " * series emphasize * }
+      if$
+      "volume and number" number either.or.check
+    }
+  if$
+}
+
+FUNCTION {format.number.series}
+{ volume empty$
+    { number empty$
+        { series field.or.null }
+        { output.state mid.sentence =
+            { "number" }
+            { "Number" }
+          if$
+          number tie.or.space.connect
+          series empty$
+            { "there's a number but no series in " cite$ * warning$ }
+            { " in " * series * }
+          if$
+        }
+      if$
+    }
+    { "" }
+  if$
+}
+
+FUNCTION {format.edition}
+{ edition empty$
+    { "" }
+    { output.state mid.sentence =
+        { edition "l" change.case$ " edition" * }
+        { edition "t" change.case$ " edition" * }
+      if$
+    }
+  if$
+}
+
+INTEGERS { multiresult }
+
+FUNCTION {multi.page.check}
+{ 't :=
+  #0 'multiresult :=
+    { multiresult not
+      t empty$ not
+      and
+    }
+    { t #1 #1 substring$
+      duplicate$ "-" =
+      swap$ duplicate$ "," =
+      swap$ "+" =
+      or or
+        { #1 'multiresult := }
+        { t #2 global.max$ substring$ 't := }
+      if$
+    }
+  while$
+  multiresult
+}
+
+FUNCTION {format.pages}
+{ pages empty$
+    { "" }
+    { pages multi.page.check
+        { "pages" pages n.dashify tie.or.space.connect }
+        { "page" pages tie.or.space.connect }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.vol.num.pages}
+{ volume field.or.null
+  number empty$
+    'skip$
+    { "(" number * ")" * *
+      volume empty$
+        { "there's a number but no volume in " cite$ * warning$ }
+        'skip$
+      if$
+    }
+  if$
+  pages empty$
+    'skip$
+    { duplicate$ empty$
+        { pop$ format.pages }
+        { ":" * pages n.dashify * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.chapter.pages}
+{ chapter empty$
+    'format.pages
+    { type empty$
+        { "chapter" }
+        { type "l" change.case$ }
+      if$
+      chapter tie.or.space.connect
+      pages empty$
+        'skip$
+        { ", " * format.pages * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.in.ed.booktitle}
+{ booktitle empty$
+    { "" }
+    { editor empty$
+        { "In " booktitle emphasize * }
+        { "In " format.editors * ", " * booktitle emphasize * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {empty.misc.check}
+{ author empty$ title empty$ howpublished empty$
+  month empty$ year empty$ note empty$
+  and and and and and
+  key empty$ not and
+    { "all relevant fields are empty in " cite$ * warning$ }
+    'skip$
+  if$
+}
+
+FUNCTION {format.thesis.type}
+{ type empty$
+    'skip$
+    { pop$
+      type "t" change.case$
+    }
+  if$
+}
+
+FUNCTION {format.tr.number}
+{ type empty$
+    { "Technical Report" }
+    'type
+  if$
+  number empty$
+    { "t" change.case$ }
+    { number tie.or.space.connect }
+  if$
+}
+
+FUNCTION {format.article.crossref}
+{ key empty$
+    { journal empty$
+        { "need key or journal for " cite$ * " to crossref " * crossref *
+          warning$
+          ""
+        }
+        { "In {\em " journal * "\/}" * }
+      if$
+    }
+    { "In " key * }
+  if$
+  " \cite{" * crossref * "}" *
+}
+
+FUNCTION {format.crossref.editor}
+{ editor #1 "{vv~}{ll}" format.name$
+  editor num.names$ duplicate$
+  #2 >
+    { pop$ " et~al." * }
+    { #2 <
+        'skip$
+        { editor #2 "{ff }{vv }{ll}{ jj}" format.name$ "others" =
+            { " et~al." * }
+            { " and " * editor #2 "{vv~}{ll}" format.name$ * }
+          if$
+        }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.book.crossref}
+{ volume empty$
+    { "empty volume in " cite$ * "'s crossref of " * crossref * warning$
+      "In "
+    }
+    { "Volume" volume tie.or.space.connect
+      " of " *
+    }
+  if$
+  editor empty$
+  editor field.or.null author field.or.null =
+  or
+    { key empty$
+        { series empty$
+            { "need editor, key, or series for " cite$ * " to crossref " *
+              crossref * warning$
+              "" *
+            }
+            { "{\em " * series * "\/}" * }
+          if$
+        }
+        { key * }
+      if$
+    }
+    { format.crossref.editor * }
+  if$
+  " \cite{" * crossref * "}" *
+}
+
+FUNCTION {format.incoll.inproc.crossref}
+{ editor empty$
+  editor field.or.null author field.or.null =
+  or
+    { key empty$
+        { booktitle empty$
+            { "need editor, key, or booktitle for " cite$ * " to crossref " *
+              crossref * warning$
+              ""
+            }
+            { "In {\em " booktitle * "\/}" * }
+          if$
+        }
+        { "In " key * }
+      if$
+    }
+    { "In " format.crossref.editor * }
+  if$
+  " \cite{" * crossref * "}" *
+}
+
+FUNCTION {article}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  new.block
+  format.title "title" output.check
+  new.block
+  crossref missing$
+    { journal emphasize "journal" output.check
+      format.vol.num.pages output
+      format.date "year" output.check
+    }
+    { format.article.crossref output.nonnull
+      format.pages output
+    }
+  if$
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {book}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  author empty$
+    { format.editors "author and editor" output.check }
+    { format.authors output.nonnull
+      crossref missing$
+        { "author and editor" editor either.or.check }
+        'skip$
+      if$
+    }
+  if$
+  new.block
+  format.btitle "title" output.check
+  crossref missing$
+    { format.bvolume output
+      new.block
+      format.number.series output
+      new.sentence
+      publisher "publisher" output.check
+      address output
+    }
+    { new.block
+      format.book.crossref output.nonnull
+    }
+  if$
+  format.edition output
+  format.date "year" output.check
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {booklet}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors output
+  new.block
+  format.title "title" output.check
+  howpublished address new.block.checkb
+  howpublished output
+  address output
+  format.date output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {inbook}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  author empty$
+    { format.editors "author and editor" output.check }
+    { format.authors output.nonnull
+      crossref missing$
+        { "author and editor" editor either.or.check }
+        'skip$
+      if$
+    }
+  if$
+  new.block
+  format.btitle "title" output.check
+  crossref missing$
+    { format.bvolume output
+      format.chapter.pages "chapter and pages" output.check
+      new.block
+      format.number.series output
+      new.sentence
+      publisher "publisher" output.check
+      address output
+    }
+    { format.chapter.pages "chapter and pages" output.check
+      new.block
+      format.book.crossref output.nonnull
+    }
+  if$
+  format.edition output
+  format.date "year" output.check
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {incollection}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  new.block
+  format.title "title" output.check
+  new.block
+  crossref missing$
+    { format.in.ed.booktitle "booktitle" output.check
+      format.bvolume output
+      format.number.series output
+      format.chapter.pages output
+      new.sentence
+      publisher "publisher" output.check
+      address output
+      format.edition output
+      format.date "year" output.check
+    }
+    { format.incoll.inproc.crossref output.nonnull
+      format.chapter.pages output
+    }
+  if$
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {inproceedings}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  new.block
+  format.title "title" output.check
+  new.block
+  crossref missing$
+    { format.in.ed.booktitle "booktitle" output.check
+      format.bvolume output
+      format.number.series output
+      format.pages output
+      address empty$
+        { organization publisher new.sentence.checkb
+          organization output
+          publisher output
+          format.date "year" output.check
+        }
+        { address output.nonnull
+          format.date "year" output.check
+          new.sentence
+          organization output
+          publisher output
+        }
+      if$
+    }
+    { format.incoll.inproc.crossref output.nonnull
+      format.pages output
+    }
+  if$
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {conference} { inproceedings }
+
+FUNCTION {manual}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  author empty$
+    { organization empty$
+        'skip$
+        { organization output.nonnull
+          address output
+        }
+      if$
+    }
+    { format.authors output.nonnull }
+  if$
+  new.block
+  format.btitle "title" output.check
+  author empty$
+    { organization empty$
+        { address new.block.checka
+          address output
+        }
+        'skip$
+      if$
+    }
+    { organization address new.block.checkb
+      organization output
+      address output
+    }
+  if$
+  format.edition output
+  format.date output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {mastersthesis}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  new.block
+  format.title "title" output.check
+  new.block
+  "Master's thesis" format.thesis.type output.nonnull
+  school "school" output.check
+  address output
+  format.date "year" output.check
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {misc}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors output
+  title howpublished new.block.checkb
+  format.title output
+  howpublished new.block.checka
+  howpublished output
+  format.date output
+  new.block
+  note output
+  fin.entry
+  empty.misc.check
+}
+
+FUNCTION {phdthesis}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  new.block
+  format.btitle "title" output.check
+  new.block
+  "PhD thesis" format.thesis.type output.nonnull
+  school "school" output.check
+  address output
+  format.date "year" output.check
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {proceedings}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  editor empty$
+    { organization output }
+    { format.editors output.nonnull }
+  if$
+  new.block
+  format.btitle "title" output.check
+  format.bvolume output
+  format.number.series output
+  address empty$
+    { editor empty$
+        { publisher new.sentence.checka }
+        { organization publisher new.sentence.checkb
+          organization output
+        }
+      if$
+      publisher output
+      format.date "year" output.check
+    }
+    { address output.nonnull
+      format.date "year" output.check
+      new.sentence
+      editor empty$
+        'skip$
+        { organization output }
+      if$
+      publisher output
+    }
+  if$
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {techreport}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  new.block
+  format.title "title" output.check
+  new.block
+  format.tr.number output.nonnull
+  institution "institution" output.check
+  address output
+  format.date "year" output.check
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {unpublished}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  new.block
+  format.title "title" output.check
+  new.block
+  note "note" output.check
+  format.date output
+  fin.entry
+}
+
+FUNCTION {default.type} { misc }
+
+MACRO {jan} {"Jan."}
+
+MACRO {feb} {"Feb."}
+
+MACRO {mar} {"Mar."}
+
+MACRO {apr} {"Apr."}
+
+MACRO {may} {"May"}
+
+MACRO {jun} {"June"}
+
+MACRO {jul} {"July"}
+
+MACRO {aug} {"Aug."}
+
+MACRO {sep} {"Sept."}
+
+MACRO {oct} {"Oct."}
+
+MACRO {nov} {"Nov."}
+
+MACRO {dec} {"Dec."}
+
+MACRO {acmcs} {"ACM Comput. Surv."}
+
+MACRO {acta} {"Acta Inf."}
+
+MACRO {cacm} {"Commun. ACM"}
+
+MACRO {ibmjrd} {"IBM J. Res. Dev."}
+
+MACRO {ibmsj} {"IBM Syst.~J."}
+
+MACRO {ieeese} {"IEEE Trans. Softw. Eng."}
+
+MACRO {ieeetc} {"IEEE Trans. Comput."}
+
+MACRO {ieeetcad}
+ {"IEEE Trans. Comput.-Aided Design Integrated Circuits"}
+
+MACRO {ipl} {"Inf. Process. Lett."}
+
+MACRO {jacm} {"J.~ACM"}
+
+MACRO {jcss} {"J.~Comput. Syst. Sci."}
+
+MACRO {scp} {"Sci. Comput. Programming"}
+
+MACRO {sicomp} {"SIAM J. Comput."}
+
+MACRO {tocs} {"ACM Trans. Comput. Syst."}
+
+MACRO {tods} {"ACM Trans. Database Syst."}
+
+MACRO {tog} {"ACM Trans. Gr."}
+
+MACRO {toms} {"ACM Trans. Math. Softw."}
+
+MACRO {toois} {"ACM Trans. Office Inf. Syst."}
+
+MACRO {toplas} {"ACM Trans. Prog. Lang. Syst."}
+
+MACRO {tcs} {"Theoretical Comput. Sci."}
+
+READ
+
+FUNCTION {sortify}
+{ purify$
+  "l" change.case$
+}
+
+INTEGERS { len }
+
+FUNCTION {chop.word}
+{ 's :=
+  'len :=
+  s #1 len substring$ =
+    { s len #1 + global.max$ substring$ }
+    's
+  if$
+}
+
+FUNCTION {sort.format.names}
+{ 's :=
+  #1 'nameptr :=
+  ""
+  s num.names$ 'numnames :=
+  numnames 'namesleft :=
+    { namesleft #0 > }
+    { nameptr #1 >
+        { "   " * }
+        'skip$
+      if$
+      s nameptr "{vv{ } }{ll{ }}{  f{ }}{  jj{ }}" format.name$ 't :=
+      nameptr numnames = t "others" = and
+        { "et al" * }
+        { t sortify * }
+      if$
+      nameptr #1 + 'nameptr :=
+      namesleft #1 - 'namesleft :=
+    }
+  while$
+}
+
+FUNCTION {sort.format.title}
+{ 't :=
+  "A " #2
+    "An " #3
+      "The " #4 t chop.word
+    chop.word
+  chop.word
+  sortify
+  #1 global.max$ substring$
+}
+
+FUNCTION {author.sort}
+{ author empty$
+    { key empty$
+        { "to sort, need author or key in " cite$ * warning$
+          ""
+        }
+        { key sortify }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+
+FUNCTION {author.editor.sort}
+{ author empty$
+    { editor empty$
+        { key empty$
+            { "to sort, need author, editor, or key in " cite$ * warning$
+              ""
+            }
+            { key sortify }
+          if$
+        }
+        { editor sort.format.names }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+
+FUNCTION {author.organization.sort}
+{ author empty$
+    { organization empty$
+        { key empty$
+            { "to sort, need author, organization, or key in " cite$ * warning$
+              ""
+            }
+            { key sortify }
+          if$
+        }
+        { "The " #4 organization chop.word sortify }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+
+FUNCTION {editor.organization.sort}
+{ editor empty$
+    { organization empty$
+        { key empty$
+            { "to sort, need editor, organization, or key in " cite$ * warning$
+              ""
+            }
+            { key sortify }
+          if$
+        }
+        { "The " #4 organization chop.word sortify }
+      if$
+    }
+    { editor sort.format.names }
+  if$
+}
+
+FUNCTION {presort}
+{ type$ "book" =
+  type$ "inbook" =
+  or
+    'author.editor.sort
+    { type$ "proceedings" =
+        'editor.organization.sort
+        { type$ "manual" =
+            'author.organization.sort
+            'author.sort
+          if$
+        }
+      if$
+    }
+  if$
+  "    "
+  *
+  year field.or.null sortify
+  *
+  "    "
+  *
+  title field.or.null
+  sort.format.title
+  *
+  #1 entry.max$ substring$
+  'sort.key$ :=
+}
+
+ITERATE {presort}
+
+SORT
+
+STRINGS { longest.label }
+
+INTEGERS { number.label longest.label.width }
+
+FUNCTION {initialize.longest.label}
+{ "" 'longest.label :=
+  "\" 'cur.letter :=
+  #1 'first.letter.place :=
+  #1 'number.label :=
+  #0 'longest.label.width :=
+}
+
+FUNCTION { def.alphabibitem }
+{ "\def\alphabibitem#1{%" write$ newline$
+  "\expandafter\ifx\csname firstalphabibitem\endcsname" write$ newline$
+  "\relax\def\firstalphabibitem{}" write$ newline$
+  "\else\expandafter" write$ newline$
+  "\ifx\csname alphabibitemskip\endcsname" write$ newline$
+  "\relax\bigskip" write$ newline$
+  "\else\alphabibitemskip" write$ newline$
+  "\fi" write$ newline$
+  "\fi" write$ newline$
+  "\penalty-200\expandafter" write$ newline$
+  "\ifx\csname alphabibitemlabel\endcsname" write$ newline$
+  "\relax\expandafter" write$ newline$
+  "\ifx\csname alphabibitemcontent\endcsname\relax" write$ newline$
+  "\item[\LARGE\bfseries\MakeUppercase{#1}]" write$ newline$
+  "\hfill\vskip 1ex\hrule\medskip" write$ newline$
+  "\else\item[\Large\bfseries\MakeUppercase{#1}]" write$ newline$
+  "\alphabibitemcontent{\MakeUppercase{#1}}%" write$ newline$
+  "\fi" write$ newline$
+  "\else\expandafter" write$ newline$
+  "\ifx\csname alphabibitemcontent\endcsname\relax" write$ newline$
+  "\item[\alphabibitemlabel{\MakeUppercase{#1}}]" write$ newline$
+  "\vskip 1ex\hrule\medskip" write$ newline$
+  "\else\item[\alphabibitemlabel{\MakeUppercase{#1}}]" write$ newline$
+  "\alphabibitemcontent{\MakeUppercase{#1}}%" write$ newline$
+  "\fi" write$ newline$
+  "\fi}" write$ newline$
+   newline$
+}
+
+FUNCTION {longest.label.pass}
+{ number.label int.to.str$ 'label :=
+  number.label #1 + 'number.label :=
+  label width$ longest.label.width >
+    { label 'longest.label :=
+      label width$ 'longest.label.width :=
+    }
+    'skip$
+  if$
+}
+
+EXECUTE {initialize.longest.label}
+
+ITERATE {longest.label.pass}
+
+FUNCTION {begin.bib}
+{ preamble$ empty$
+    'skip$
+    { preamble$ write$ newline$ }
+  if$
+  def.alphabibitem
+  "\begin{thebibliography}{"  longest.label  * "}" * write$ newline$
+}
+
+EXECUTE {begin.bib}
+
+EXECUTE {init.state.consts}
+
+ITERATE {call.type$}
+
+FUNCTION {end.bib}
+{ newline$
+  "\end{thebibliography}" write$ newline$
+}
+
+EXECUTE {end.bib}
diff --git a/Master/texmf-dist/bibtex/bst/sort-by-letters/alpha-letters.bst b/Master/texmf-dist/bibtex/bst/sort-by-letters/alpha-letters.bst
new file mode 100644
index 00000000000..59e833c6721
--- /dev/null
+++ b/Master/texmf-dist/bibtex/bst/sort-by-letters/alpha-letters.bst
@@ -0,0 +1,1377 @@
+% BibTeX bibliography style `alpha-letters'
+%% adapted from standard style `alpha'
+%% (C) 2006 - Thomas van Oudenhove 
+%% when sorting by letter, write the first letter of author 
+%% or editor - bug with organization...
+
+ENTRY
+  { address
+    author
+    booktitle
+    chapter
+    edition
+    editor
+    howpublished
+    institution
+    journal
+    key
+    month
+    note
+    number
+    organization
+    pages
+    publisher
+    school
+    series
+    title
+    type
+    volume
+    year
+  }
+  {}
+  { label extra.label sort.label }
+
+INTEGERS { output.state before.all mid.sentence after.sentence after.block }
+
+FUNCTION {init.state.consts}
+{ #0 'before.all :=
+  #1 'mid.sentence :=
+  #2 'after.sentence :=
+  #3 'after.block :=
+}
+
+STRINGS { s t cur.letter first.letter }
+INTEGERS { first.letter.place first.letter.ascii }
+
+FUNCTION {output.nonnull}
+{ 's :=
+  output.state mid.sentence =
+    { ", " * write$ }
+    { output.state after.block =
+	{ add.period$ write$
+	  newline$
+	  "\newblock " write$
+	}
+	{ output.state before.all =
+	    'write$
+	    { add.period$ " " * write$ }
+	  if$
+	}
+      if$
+      mid.sentence 'output.state :=
+    }
+  if$
+  s
+}
+
+FUNCTION {output}
+{ duplicate$ empty$
+    'pop$
+    'output.nonnull
+  if$
+}
+
+FUNCTION {output.check}
+{ 't :=
+  duplicate$ empty$
+    { pop$ "empty " t * " in " * cite$ * warning$ }
+    'output.nonnull
+  if$
+}
+
+FUNCTION {output.letter}
+{ first.letter cur.letter =
+    { skip$ }
+    { newline$
+      "\alphabibitem{" first.letter * "}" * write$
+      newline$ 
+      first.letter 'cur.letter := }
+  if$
+  cur.letter "\" = 
+    { first.letter 'cur.letter := }
+    { skip$ }
+  if$
+}
+
+FUNCTION {output.bibitem}
+{ newline$
+  "\bibitem[" write$
+  label write$
+  "]{" write$
+  cite$ write$
+  "}" write$
+  newline$
+  ""
+  before.all 'output.state :=
+}
+
+FUNCTION {fin.entry}
+{ add.period$
+  write$
+  newline$
+}
+
+FUNCTION {new.block}
+{ output.state before.all =
+    'skip$
+    { after.block 'output.state := }
+  if$
+}
+
+FUNCTION {new.sentence}
+{ output.state after.block =
+    'skip$
+    { output.state before.all =
+	'skip$
+	{ after.sentence 'output.state := }
+      if$
+    }
+  if$
+}
+
+FUNCTION {not}
+{   { #0 }
+    { #1 }
+  if$
+}
+
+FUNCTION {and}
+{   'skip$
+    { pop$ #0 }
+  if$
+}
+
+FUNCTION {or}
+{   { pop$ #1 }
+    'skip$
+  if$
+}
+
+FUNCTION {new.block.checka}
+{ empty$
+    'skip$
+    'new.block
+  if$
+}
+
+FUNCTION {new.block.checkb}
+{ empty$
+  swap$ empty$
+  and
+    'skip$
+    'new.block
+  if$
+}
+
+FUNCTION {new.sentence.checka}
+{ empty$
+    'skip$
+    'new.sentence
+  if$
+}
+
+FUNCTION {new.sentence.checkb}
+{ empty$
+  swap$ empty$
+  and
+    'skip$
+    'new.sentence
+  if$
+}
+
+FUNCTION {field.or.null}
+{ duplicate$ empty$
+    { pop$ "" }
+    'skip$
+  if$
+}
+
+FUNCTION {emphasize}
+{ duplicate$ empty$
+    { pop$ "" }
+    { "{\em " swap$ * "}" * }
+  if$
+}
+
+FUNCTION { author.find.first.letter }
+{ author #1 "{vv }{ll }{ff }, {jj }" format.name$ "u" change.case$
+  purify$ first.letter.place #1 substring$ 'first.letter := 
+  first.letter chr.to.int$ 'first.letter.ascii :=
+}
+
+FUNCTION { editor.find.first.letter }
+{ editor #1 "{vv }{ll }{ff }, {jj }" format.name$ "u" change.case$ 
+  purify$ first.letter.place #1 substring$ 'first.letter :=
+  first.letter chr.to.int$ 'first.letter.ascii :=
+}
+
+FUNCTION { organization.find.first.letter }
+{ organization #1 "{vv }{ll }{ff }, {jj }" format.name$ "u" change.case$
+  purify$ first.letter.place #1 substring$ 'first.letter := 
+  first.letter chr.to.int$ 'first.letter.ascii :=
+}
+
+FUNCTION { find.firstletter }
+{ author empty$
+    { editor empty$
+%        { organization empty$
+          { "Nor author, editor neither organization for entry " cite$ * warning$ }
+%          { organization.find.first.letter
+%            { first.letter.ascii #64 > first.letter.ascii #91 < and
+%              first.letter.ascii #96 > first.letter.ascii #123 < and or not }
+%            { first.letter.place #1 + 'first.letter.place :=
+%              organization.find.first.letter }
+%          while$ }
+%          if$ }
+        { editor.find.first.letter
+          { first.letter.ascii #64 > first.letter.ascii #91 < and
+            first.letter.ascii #96 > first.letter.ascii #123 < and or not }
+          { first.letter.place #1 + 'first.letter.place :=
+            editor.find.first.letter }
+        while$
+        }
+      if$
+    }
+    { author.find.first.letter
+      { first.letter.ascii #64 > first.letter.ascii #91 < and
+        first.letter.ascii #96 > first.letter.ascii #123 < and or not }
+      { first.letter.place #1 + 'first.letter.place :=
+        author.find.first.letter }
+    while$
+    }
+  if$
+  #1 'first.letter.place :=
+}
+
+INTEGERS { nameptr namesleft numnames }
+
+FUNCTION {format.names}
+{ 's :=
+  #1 'nameptr :=
+  s num.names$ 'numnames :=
+  numnames 'namesleft :=
+    { namesleft #0 > }
+    { s nameptr "{ff~}{vv~}{ll}{, jj}" format.name$ 't :=
+      nameptr #1 >
+	{ namesleft #1 >
+	    { ", " * t * }
+	    { numnames #2 >
+		{ "," * }
+		'skip$
+	      if$
+	      t "others" =
+		{ " et~al." * }
+		{ " and " * t * }
+	      if$
+	    }
+	  if$
+	}
+	't
+      if$
+      nameptr #1 + 'nameptr :=
+      namesleft #1 - 'namesleft :=
+    }
+  while$
+}
+
+FUNCTION {format.authors}
+{ author empty$
+    { "" }
+    { author format.names }
+  if$
+}
+
+FUNCTION {format.editors}
+{ editor empty$
+    { "" }
+    { editor format.names
+      editor num.names$ #1 >
+	{ ", editors" * }
+	{ ", editor" * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.title}
+{ title empty$
+    { "" }
+    { title "t" change.case$ }
+  if$
+}
+
+FUNCTION {n.dashify}
+{ 't :=
+  ""
+    { t empty$ not }
+    { t #1 #1 substring$ "-" =
+	{ t #1 #2 substring$ "--" = not
+	    { "--" *
+	      t #2 global.max$ substring$ 't :=
+	    }
+	    {   { t #1 #1 substring$ "-" = }
+		{ "-" *
+		  t #2 global.max$ substring$ 't :=
+		}
+	      while$
+	    }
+	  if$
+	}
+	{ t #1 #1 substring$ *
+	  t #2 global.max$ substring$ 't :=
+	}
+      if$
+    }
+  while$
+}
+
+FUNCTION {format.date}
+{ year empty$
+    { month empty$
+	{ "" }
+	{ "there's a month but no year in " cite$ * warning$
+	  month
+	}
+      if$
+    }
+    { month empty$
+	'year
+	{ month " " * year * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.btitle}
+{ title emphasize
+}
+
+FUNCTION {tie.or.space.connect}
+{ duplicate$ text.length$ #3 <
+    { "~" }
+    { " " }
+  if$
+  swap$ * *
+}
+
+FUNCTION {either.or.check}
+{ empty$
+    'pop$
+    { "can't use both " swap$ * " fields in " * cite$ * warning$ }
+  if$
+}
+
+FUNCTION {format.bvolume}
+{ volume empty$
+    { "" }
+    { "volume" volume tie.or.space.connect
+      series empty$
+	'skip$
+	{ " of " * series emphasize * }
+      if$
+      "volume and number" number either.or.check
+    }
+  if$
+}
+
+FUNCTION {format.number.series}
+{ volume empty$
+    { number empty$
+	{ series field.or.null }
+	{ output.state mid.sentence =
+	    { "number" }
+	    { "Number" }
+	  if$
+	  number tie.or.space.connect
+	  series empty$
+	    { "there's a number but no series in " cite$ * warning$ }
+	    { " in " * series * }
+	  if$
+	}
+      if$
+    }
+    { "" }
+  if$
+}
+
+FUNCTION {format.edition}
+{ edition empty$
+    { "" }
+    { output.state mid.sentence =
+	{ edition "l" change.case$ " edition" * }
+	{ edition "t" change.case$ " edition" * }
+      if$
+    }
+  if$
+}
+
+INTEGERS { multiresult }
+
+FUNCTION {multi.page.check}
+{ 't :=
+  #0 'multiresult :=
+    { multiresult not
+      t empty$ not
+      and
+    }
+    { t #1 #1 substring$
+      duplicate$ "-" =
+      swap$ duplicate$ "," =
+      swap$ "+" =
+      or or
+	{ #1 'multiresult := }
+	{ t #2 global.max$ substring$ 't := }
+      if$
+    }
+  while$
+  multiresult
+}
+
+FUNCTION {format.pages}
+{ pages empty$
+    { "" }
+    { pages multi.page.check
+	{ "pages" pages n.dashify tie.or.space.connect }
+	{ "page" pages tie.or.space.connect }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.vol.num.pages}
+{ volume field.or.null
+  number empty$
+    'skip$
+    { "(" number * ")" * *
+      volume empty$
+	{ "there's a number but no volume in " cite$ * warning$ }
+	'skip$
+      if$
+    }
+  if$
+  pages empty$
+    'skip$
+    { duplicate$ empty$
+	{ pop$ format.pages }
+	{ ":" * pages n.dashify * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.chapter.pages}
+{ chapter empty$
+    'format.pages
+    { type empty$
+	{ "chapter" }
+	{ type "l" change.case$ }
+      if$
+      chapter tie.or.space.connect
+      pages empty$
+	'skip$
+	{ ", " * format.pages * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.in.ed.booktitle}
+{ booktitle empty$
+    { "" }
+    { editor empty$
+	{ "In " booktitle emphasize * }
+	{ "In " format.editors * ", " * booktitle emphasize * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {empty.misc.check}
+{ author empty$ title empty$ howpublished empty$
+  month empty$ year empty$ note empty$
+  and and and and and
+  key empty$ not and
+    { "all relevant fields are empty in " cite$ * warning$ }
+    'skip$
+  if$
+}
+
+FUNCTION {format.thesis.type}
+{ type empty$
+    'skip$
+    { pop$
+      type "t" change.case$
+    }
+  if$
+}
+
+FUNCTION {format.tr.number}
+{ type empty$
+    { "Technical Report" }
+    'type
+  if$
+  number empty$
+    { "t" change.case$ }
+    { number tie.or.space.connect }
+  if$
+}
+
+FUNCTION {format.article.crossref}
+{ key empty$
+    { journal empty$
+	{ "need key or journal for " cite$ * " to crossref " * crossref *
+	  warning$
+	  ""
+	}
+	{ "In {\em " journal * "\/}" * }
+      if$
+    }
+    { "In " key * }
+  if$
+  " \cite{" * crossref * "}" *
+}
+
+FUNCTION {format.crossref.editor}
+{ editor #1 "{vv~}{ll}" format.name$
+  editor num.names$ duplicate$
+  #2 >
+    { pop$ " et~al." * }
+    { #2 <
+	'skip$
+	{ editor #2 "{ff }{vv }{ll}{ jj}" format.name$ "others" =
+	    { " et~al." * }
+	    { " and " * editor #2 "{vv~}{ll}" format.name$ * }
+	  if$
+	}
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.book.crossref}
+{ volume empty$
+    { "empty volume in " cite$ * "'s crossref of " * crossref * warning$
+      "In "
+    }
+    { "Volume" volume tie.or.space.connect
+      " of " *
+    }
+  if$
+  editor empty$
+  editor field.or.null author field.or.null =
+  or
+    { key empty$
+	{ series empty$
+	    { "need editor, key, or series for " cite$ * " to crossref " *
+	      crossref * warning$
+	      "" *
+	    }
+	    { "{\em " * series * "\/}" * }
+	  if$
+	}
+	{ key * }
+      if$
+    }
+    { format.crossref.editor * }
+  if$
+  " \cite{" * crossref * "}" *
+}
+
+FUNCTION {format.incoll.inproc.crossref}
+{ editor empty$
+  editor field.or.null author field.or.null =
+  or
+    { key empty$
+	{ booktitle empty$
+	    { "need editor, key, or booktitle for " cite$ * " to crossref " *
+	      crossref * warning$
+	      ""
+	    }
+	    { "In {\em " booktitle * "\/}" * }
+	  if$
+	}
+	{ "In " key * }
+      if$
+    }
+    { "In " format.crossref.editor * }
+  if$
+  " \cite{" * crossref * "}" *
+}
+
+FUNCTION {article}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  new.block
+  format.title "title" output.check
+  new.block
+  crossref missing$
+    { journal emphasize "journal" output.check
+      format.vol.num.pages output
+      format.date "year" output.check
+    }
+    { format.article.crossref output.nonnull
+      format.pages output
+    }
+  if$
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {book}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  author empty$
+    { format.editors "author and editor" output.check }
+    { format.authors output.nonnull
+      crossref missing$
+	{ "author and editor" editor either.or.check }
+	'skip$
+      if$
+    }
+  if$
+  new.block
+  format.btitle "title" output.check
+  crossref missing$
+    { format.bvolume output
+      new.block
+      format.number.series output
+      new.sentence
+      publisher "publisher" output.check
+      address output
+    }
+    { new.block
+      format.book.crossref output.nonnull
+    }
+  if$
+  format.edition output
+  format.date "year" output.check
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {booklet}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors output
+  new.block
+  format.title "title" output.check
+  howpublished address new.block.checkb
+  howpublished output
+  address output
+  format.date output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {inbook}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  author empty$
+    { format.editors "author and editor" output.check }
+    { format.authors output.nonnull
+      crossref missing$
+	{ "author and editor" editor either.or.check }
+	'skip$
+      if$
+    }
+  if$
+  new.block
+  format.btitle "title" output.check
+  crossref missing$
+    { format.bvolume output
+      format.chapter.pages "chapter and pages" output.check
+      new.block
+      format.number.series output
+      new.sentence
+      publisher "publisher" output.check
+      address output
+    }
+    { format.chapter.pages "chapter and pages" output.check
+      new.block
+      format.book.crossref output.nonnull
+    }
+  if$
+  format.edition output
+  format.date "year" output.check
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {incollection}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  new.block
+  format.title "title" output.check
+  new.block
+  crossref missing$
+    { format.in.ed.booktitle "booktitle" output.check
+      format.bvolume output
+      format.number.series output
+      format.chapter.pages output
+      new.sentence
+      publisher "publisher" output.check
+      address output
+      format.edition output
+      format.date "year" output.check
+    }
+    { format.incoll.inproc.crossref output.nonnull
+      format.chapter.pages output
+    }
+  if$
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {inproceedings}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  new.block
+  format.title "title" output.check
+  new.block
+  crossref missing$
+    { format.in.ed.booktitle "booktitle" output.check
+      format.bvolume output
+      format.number.series output
+      format.pages output
+      address empty$
+	{ organization publisher new.sentence.checkb
+	  organization output
+	  publisher output
+	  format.date "year" output.check
+	}
+	{ address output.nonnull
+	  format.date "year" output.check
+	  new.sentence
+	  organization output
+	  publisher output
+	}
+      if$
+    }
+    { format.incoll.inproc.crossref output.nonnull
+      format.pages output
+    }
+  if$
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {conference} { inproceedings }
+
+FUNCTION {manual}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  author empty$
+    { organization empty$
+	'skip$
+	{ organization output.nonnull
+	  address output
+	}
+      if$
+    }
+    { format.authors output.nonnull }
+  if$
+  new.block
+  format.btitle "title" output.check
+  author empty$
+    { organization empty$
+	{ address new.block.checka
+	  address output
+	}
+	'skip$
+      if$
+    }
+    { organization address new.block.checkb
+      organization output
+      address output
+    }
+  if$
+  format.edition output
+  format.date output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {mastersthesis}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  new.block
+  format.title "title" output.check
+  new.block
+  "Master's thesis" format.thesis.type output.nonnull
+  school "school" output.check
+  address output
+  format.date "year" output.check
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {misc}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors output
+  title howpublished new.block.checkb
+  format.title output
+  howpublished new.block.checka
+  howpublished output
+  format.date output
+  new.block
+  note output
+  fin.entry
+  empty.misc.check
+}
+
+FUNCTION {phdthesis}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  new.block
+  format.btitle "title" output.check
+  new.block
+  "PhD thesis" format.thesis.type output.nonnull
+  school "school" output.check
+  address output
+  format.date "year" output.check
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {proceedings}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  editor empty$
+    { organization output }
+    { format.editors output.nonnull }
+  if$
+  new.block
+  format.btitle "title" output.check
+  format.bvolume output
+  format.number.series output
+  address empty$
+    { editor empty$
+	{ publisher new.sentence.checka }
+	{ organization publisher new.sentence.checkb
+	  organization output
+	}
+      if$
+      publisher output
+      format.date "year" output.check
+    }
+    { address output.nonnull
+      format.date "year" output.check
+      new.sentence
+      editor empty$
+	'skip$
+	{ organization output }
+      if$
+      publisher output
+    }
+  if$
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {techreport}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  new.block
+  format.title "title" output.check
+  new.block
+  format.tr.number output.nonnull
+  institution "institution" output.check
+  address output
+  format.date "year" output.check
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {unpublished}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  new.block
+  format.title "title" output.check
+  new.block
+  note "note" output.check
+  format.date output
+  fin.entry
+}
+
+FUNCTION {default.type} { misc }
+
+MACRO {jan} {"January"}
+
+MACRO {feb} {"February"}
+
+MACRO {mar} {"March"}
+
+MACRO {apr} {"April"}
+
+MACRO {may} {"May"}
+
+MACRO {jun} {"June"}
+
+MACRO {jul} {"July"}
+
+MACRO {aug} {"August"}
+
+MACRO {sep} {"September"}
+
+MACRO {oct} {"October"}
+
+MACRO {nov} {"November"}
+
+MACRO {dec} {"December"}
+
+MACRO {acmcs} {"ACM Computing Surveys"}
+
+MACRO {acta} {"Acta Informatica"}
+
+MACRO {cacm} {"Communications of the ACM"}
+
+MACRO {ibmjrd} {"IBM Journal of Research and Development"}
+
+MACRO {ibmsj} {"IBM Systems Journal"}
+
+MACRO {ieeese} {"IEEE Transactions on Software Engineering"}
+
+MACRO {ieeetc} {"IEEE Transactions on Computers"}
+
+MACRO {ieeetcad}
+ {"IEEE Transactions on Computer-Aided Design of Integrated Circuits"}
+
+MACRO {ipl} {"Information Processing Letters"}
+
+MACRO {jacm} {"Journal of the ACM"}
+
+MACRO {jcss} {"Journal of Computer and System Sciences"}
+
+MACRO {scp} {"Science of Computer Programming"}
+
+MACRO {sicomp} {"SIAM Journal on Computing"}
+
+MACRO {tocs} {"ACM Transactions on Computer Systems"}
+
+MACRO {tods} {"ACM Transactions on Database Systems"}
+
+MACRO {tog} {"ACM Transactions on Graphics"}
+
+MACRO {toms} {"ACM Transactions on Mathematical Software"}
+
+MACRO {toois} {"ACM Transactions on Office Information Systems"}
+
+MACRO {toplas} {"ACM Transactions on Programming Languages and Systems"}
+
+MACRO {tcs} {"Theoretical Computer Science"}
+
+READ
+
+FUNCTION {sortify}
+{ purify$
+  "l" change.case$
+}
+
+INTEGERS { len }
+
+FUNCTION {chop.word}
+{ 's :=
+  'len :=
+  s #1 len substring$ =
+    { s len #1 + global.max$ substring$ }
+    's
+  if$
+}
+
+INTEGERS { et.al.char.used }
+
+FUNCTION {initialize.et.al.char.used}
+{ #0 'et.al.char.used :=
+}
+
+EXECUTE {initialize.et.al.char.used}
+
+FUNCTION {format.lab.names}
+{ 's :=
+  s num.names$ 'numnames :=
+  numnames #1 >
+    { numnames #4 >
+	{ #3 'namesleft := }
+	{ numnames 'namesleft := }
+      if$
+      #1 'nameptr :=
+      ""
+	{ namesleft #0 > }
+	{ nameptr numnames =
+	    { s nameptr "{ff }{vv }{ll}{ jj}" format.name$ "others" =
+		{ "{\etalchar{+}}" *
+		  #1 'et.al.char.used :=
+		}
+		{ s nameptr "{v{}}{l{}}" format.name$ * }
+	      if$
+	    }
+	    { s nameptr "{v{}}{l{}}" format.name$ * }
+	  if$
+	  nameptr #1 + 'nameptr :=
+	  namesleft #1 - 'namesleft :=
+	}
+      while$
+      numnames #4 >
+	{ "{\etalchar{+}}" *
+	  #1 'et.al.char.used :=
+	}
+	'skip$
+      if$
+    }
+    { s #1 "{v{}}{l{}}" format.name$
+      duplicate$ text.length$ #2 <
+	{ pop$ s #1 "{ll}" format.name$ #3 text.prefix$ }
+	'skip$
+      if$
+    }
+  if$
+}
+
+FUNCTION {author.key.label}
+{ author empty$
+    { key empty$
+	{ cite$ #1 #3 substring$ }
+	{ key #3 text.prefix$ }
+      if$
+    }
+    { author format.lab.names }
+  if$
+}
+
+FUNCTION {author.editor.key.label}
+{ author empty$
+    { editor empty$
+	{ key empty$
+	    { cite$ #1 #3 substring$ }
+	    { key #3 text.prefix$ }
+	  if$
+	}
+	{ editor format.lab.names }
+      if$
+    }
+    { author format.lab.names }
+  if$
+}
+
+FUNCTION {author.key.organization.label}
+{ author empty$
+    { key empty$
+	{ organization empty$
+	    { cite$ #1 #3 substring$ }
+	    { "The " #4 organization chop.word #3 text.prefix$ }
+	  if$
+	}
+	{ key #3 text.prefix$ }
+      if$
+    }
+    { author format.lab.names }
+  if$
+}
+
+FUNCTION {editor.key.organization.label}
+{ editor empty$
+    { key empty$
+	{ organization empty$
+	    { cite$ #1 #3 substring$ }
+	    { "The " #4 organization chop.word #3 text.prefix$ }
+	  if$
+	}
+	{ key #3 text.prefix$ }
+      if$
+    }
+    { editor format.lab.names }
+  if$
+}
+
+FUNCTION {calc.label}
+{ type$ "book" =
+  type$ "inbook" =
+  or
+    'author.editor.key.label
+    { type$ "proceedings" =
+	'editor.key.organization.label
+	{ type$ "manual" =
+	    'author.key.organization.label
+	    'author.key.label
+	  if$
+	}
+      if$
+    }
+  if$
+  duplicate$
+  year field.or.null purify$ #-1 #2 substring$
+  *
+  'label :=
+  year field.or.null purify$ #-1 #4 substring$
+  *
+  sortify 'sort.label :=
+}
+
+FUNCTION {sort.format.names}
+{ 's :=
+  #1 'nameptr :=
+  ""
+  s num.names$ 'numnames :=
+  numnames 'namesleft :=
+    { namesleft #0 > }
+    { nameptr #1 >
+	{ "   " * }
+	'skip$
+      if$
+      s nameptr "{vv{ } }{ll{ }}{  ff{ }}{  jj{ }}" format.name$ 't :=
+      nameptr numnames = t "others" = and
+	{ "et al" * }
+	{ t sortify * }
+      if$
+      nameptr #1 + 'nameptr :=
+      namesleft #1 - 'namesleft :=
+    }
+  while$
+}
+
+FUNCTION {sort.format.title}
+{ 't :=
+  "A " #2
+    "An " #3
+      "The " #4 t chop.word
+    chop.word
+  chop.word
+  sortify
+  #1 global.max$ substring$
+}
+
+FUNCTION {author.sort}
+{ author empty$
+    { key empty$
+	{ "to sort, need author or key in " cite$ * warning$
+	  ""
+	}
+	{ key sortify }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+
+FUNCTION {author.editor.sort}
+{ author empty$
+    { editor empty$
+	{ key empty$
+	    { "to sort, need author, editor, or key in " cite$ * warning$
+	      ""
+	    }
+	    { key sortify }
+	  if$
+	}
+	{ editor sort.format.names }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+
+FUNCTION {author.organization.sort}
+{ author empty$
+    { organization empty$
+	{ key empty$
+	    { "to sort, need author, organization, or key in " cite$ * warning$
+	      ""
+	    }
+	    { key sortify }
+	  if$
+	}
+	{ "The " #4 organization chop.word sortify }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+
+FUNCTION {editor.organization.sort}
+{ editor empty$
+    { organization empty$
+	{ key empty$
+	    { "to sort, need editor, organization, or key in " cite$ * warning$
+	      ""
+	    }
+	    { key sortify }
+	  if$
+	}
+	{ "The " #4 organization chop.word sortify }
+      if$
+    }
+    { editor sort.format.names }
+  if$
+}
+
+FUNCTION {presort}
+{ calc.label
+  sort.label
+  "    "
+  *
+  type$ "book" =
+  type$ "inbook" =
+  or
+    'author.editor.sort
+    { type$ "proceedings" =
+	'editor.organization.sort
+	{ type$ "manual" =
+	    'author.organization.sort
+	    'author.sort
+	  if$
+	}
+      if$
+    }
+  if$
+  *
+  "    "
+  *
+  year field.or.null sortify
+  *
+  "    "
+  *
+  title field.or.null
+  sort.format.title
+  *
+  #1 entry.max$ substring$
+  'sort.key$ :=
+}
+
+ITERATE {presort}
+
+SORT
+
+STRINGS { longest.label last.sort.label next.extra }
+
+INTEGERS { longest.label.width last.extra.num }
+
+FUNCTION {initialize.longest.label}
+{ "" 'longest.label :=
+  "\" 'cur.letter :=
+  #1 'first.letter.place :=
+  #0 int.to.chr$ 'last.sort.label :=
+  "" 'next.extra :=
+  #0 'longest.label.width :=
+  #0 'last.extra.num :=
+}
+
+FUNCTION { def.alphabibitem }
+{ "\def\alphabibitem#1{%" write$ newline$
+  "\expandafter\ifx\csname firstalphabibitem\endcsname" write$ newline$
+  "\relax\def\firstalphabibitem{}" write$ newline$
+  "\else\expandafter" write$ newline$
+  "\ifx\csname alphabibitemskip\endcsname" write$ newline$
+  "\relax\bigskip" write$ newline$
+  "\else\alphabibitemskip" write$ newline$
+  "\fi" write$ newline$
+  "\fi" write$ newline$
+  "\penalty-200\expandafter" write$ newline$
+  "\ifx\csname alphabibitemlabel\endcsname" write$ newline$
+  "\relax\expandafter" write$ newline$
+  "\ifx\csname alphabibitemcontent\endcsname\relax" write$ newline$
+  "\item[\LARGE\bfseries\MakeUppercase{#1}]" write$ newline$
+  "\hfill\vskip 1ex\hrule\medskip" write$ newline$
+  "\else\item[\Large\bfseries\MakeUppercase{#1}]" write$ newline$
+  "\alphabibitemcontent{\MakeUppercase{#1}}%" write$ newline$
+  "\fi" write$ newline$
+  "\else\expandafter" write$ newline$
+  "\ifx\csname alphabibitemcontent\endcsname\relax" write$ newline$
+  "\item[\alphabibitemlabel{\MakeUppercase{#1}}]" write$ newline$
+  "\vskip 1ex\hrule\medskip" write$ newline$
+  "\else\item[\alphabibitemlabel{\MakeUppercase{#1}}]" write$ newline$
+  "\alphabibitemcontent{\MakeUppercase{#1}}%" write$ newline$
+  "\fi" write$ newline$
+  "\fi}" write$ newline$
+   newline$
+}
+
+FUNCTION {forward.pass}
+{ last.sort.label sort.label =
+    { last.extra.num #1 + 'last.extra.num :=
+      last.extra.num int.to.chr$ 'extra.label :=
+    }
+    { "a" chr.to.int$ 'last.extra.num :=
+      "" 'extra.label :=
+      sort.label 'last.sort.label :=
+    }
+  if$
+}
+
+FUNCTION {reverse.pass}
+{ next.extra "b" =
+    { "a" 'extra.label := }
+    'skip$
+  if$
+  label extra.label * 'label :=
+  label width$ longest.label.width >
+    { label 'longest.label :=
+      label width$ 'longest.label.width :=
+    }
+    'skip$
+  if$
+  extra.label 'next.extra :=
+}
+
+EXECUTE {initialize.longest.label}
+
+ITERATE {forward.pass}
+
+REVERSE {reverse.pass}
+
+FUNCTION {begin.bib}
+{ et.al.char.used
+    { "\newcommand{\etalchar}[1]{$^{#1}$}" write$ newline$ }
+    'skip$
+  if$
+  preamble$ empty$
+    'skip$
+    { preamble$ write$ newline$ }
+  if$
+  def.alphabibitem
+  "\begin{thebibliography}{"  longest.label  * "}" * write$ newline$
+}
+
+EXECUTE {begin.bib}
+
+EXECUTE {init.state.consts}
+
+ITERATE {call.type$}
+
+FUNCTION {end.bib}
+{ newline$
+  "\end{thebibliography}" write$ newline$
+}
+
+EXECUTE {end.bib}
diff --git a/Master/texmf-dist/bibtex/bst/sort-by-letters/apalike-letters.bst b/Master/texmf-dist/bibtex/bst/sort-by-letters/apalike-letters.bst
new file mode 100644
index 00000000000..ca7742ac80f
--- /dev/null
+++ b/Master/texmf-dist/bibtex/bst/sort-by-letters/apalike-letters.bst
@@ -0,0 +1,1213 @@
+% BibTeX bibliography style `apalike-letters'
+%% adapted from `apalike' bibliography style (24-Jan-88 version)
+%% (C) 2006 - Thomas van Oudenhove 
+%% when sorting by letter, write the first letter of author 
+%% or editor - bug with organization...
+% This style should be used with the `apalike' LaTeX style (apalike.sty).
+% \cite's come out like "(Jones, 1986)" in the text but there are no labels
+% in the bibliography, and something like "(1986)" comes out immediately
+% after the author.  Author (and editor) names appear as last name, comma,
+% initials.  A `year' field is required for every entry, and so is either
+% an author (or in some cases, an editor) field or a key field.
+%
+% Editorial note:
+% Many journals require a style like `apalike', but I strongly, strongly,
+% strongly recommend that you not use it if you have a choice---use something
+% like `plain' instead.  Mary-Claire van Leunen (A Handbook for Scholars,
+% Knopf, 1979) argues convincingly that a style like `plain' encourages better
+% writing than one like `apalike'.  Furthermore the strongest arguments for
+% using an author-date style like `apalike'---that it's "the most practical"
+% (The Chicago Manual of Style, University of Chicago Press, thirteenth
+% edition, 1982, pages 400--401)---fall flat on their face with the new
+% computer-typesetting technology.  For instance page 401 anachronistically
+% states "The chief disadvantage of [a style like `plain'] is that additions
+% or deletions cannot be made after the manuscript is typed without changing
+% numbers in both text references and list."  LaTeX sidesteps the disadvantage.
+
+ENTRY
+  { address
+    author
+    booktitle
+    chapter
+    edition
+    editor
+    howpublished
+    institution
+    journal
+    key
+%    month		not used in apalike
+    note
+    number
+    organization
+    pages
+    publisher
+    school
+    series
+    title
+    type
+    volume
+    year
+  }
+  {}
+  { label extra.label sort.label }
+
+INTEGERS { output.state before.all mid.sentence after.sentence after.block }
+
+FUNCTION {init.state.consts}
+{ #0 'before.all :=
+  #1 'mid.sentence :=
+  #2 'after.sentence :=
+  #3 'after.block :=
+}
+
+STRINGS { s t cur.letter first.letter }
+INTEGERS { first.letter.place first.letter.ascii }
+
+FUNCTION {output.nonnull}
+{ 's :=
+  output.state mid.sentence =
+    { ", " * write$ }
+    { output.state after.block =
+	{ add.period$ write$
+	  newline$
+	  "\newblock " write$
+	}
+	{ output.state before.all =
+	    'write$
+	    { add.period$ " " * write$ }
+	  if$
+	}
+      if$
+      mid.sentence 'output.state :=
+    }
+  if$
+  s
+}
+
+FUNCTION {output}
+{ duplicate$ empty$
+    'pop$
+    'output.nonnull
+  if$
+}
+
+FUNCTION {output.check}
+{ 't :=
+  duplicate$ empty$
+    { pop$ "empty " t * " in " * cite$ * warning$ }
+    'output.nonnull
+  if$
+}
+
+%					apalike needs this function because
+%					the year has special punctuation;
+%					apalike ignores the month
+FUNCTION {output.year.check}
+{ year empty$
+    { "empty year in " cite$ * warning$ }
+    { write$
+      " (" year * extra.label * ")" *
+      mid.sentence 'output.state :=
+    }
+  if$
+}
+
+FUNCTION {output.letter}
+{ first.letter cur.letter =
+    { skip$ }
+    { newline$
+      "\alphabibitem{" first.letter * "}" * write$
+      newline$ 
+      first.letter 'cur.letter := }
+  if$
+  cur.letter "\" = 
+    { first.letter 'cur.letter := }
+    { skip$ }
+  if$
+}
+
+FUNCTION {output.bibitem}
+{ newline$
+  "\bibitem[" write$
+  label write$
+  "]{" write$
+  cite$ write$
+  "}" write$
+  newline$
+  ""
+  before.all 'output.state :=
+}
+
+FUNCTION {fin.entry}
+{ add.period$
+  write$
+  newline$
+}
+
+FUNCTION {new.block}
+{ output.state before.all =
+    'skip$
+    { after.block 'output.state := }
+  if$
+}
+
+FUNCTION {new.sentence}
+{ output.state after.block =
+    'skip$
+    { output.state before.all =
+	'skip$
+	{ after.sentence 'output.state := }
+      if$
+    }
+  if$
+}
+
+FUNCTION {not}
+{   { #0 }
+    { #1 }
+  if$
+}
+
+FUNCTION {and}
+{   'skip$
+    { pop$ #0 }
+  if$
+}
+
+FUNCTION {or}
+{   { pop$ #1 }
+    'skip$
+  if$
+}
+
+FUNCTION {new.block.checkb}
+{ empty$
+  swap$ empty$
+  and
+    'skip$
+    'new.block
+  if$
+}
+
+FUNCTION {field.or.null}
+{ duplicate$ empty$
+    { pop$ "" }
+    'skip$
+  if$
+}
+
+FUNCTION {emphasize}
+{ duplicate$ empty$
+    { pop$ "" }
+    { "{\em " swap$ * "}" * }
+  if$
+}
+
+FUNCTION { author.find.first.letter }
+{ author #1 "{vv }{ll }{ff }, {jj }" format.name$ "u" change.case$
+  purify$ first.letter.place #1 substring$ 'first.letter := 
+  first.letter chr.to.int$ 'first.letter.ascii :=
+}
+
+FUNCTION { editor.find.first.letter }
+{ editor #1 "{vv }{ll }{ff }, {jj }" format.name$ "u" change.case$ 
+  purify$ first.letter.place #1 substring$ 'first.letter :=
+  first.letter chr.to.int$ 'first.letter.ascii :=
+}
+
+FUNCTION { organization.find.first.letter }
+{ organization #1 "{vv }{ll }{ff }, {jj }" format.name$ "u" change.case$
+  purify$ first.letter.place #1 substring$ 'first.letter := 
+  first.letter chr.to.int$ 'first.letter.ascii :=
+}
+
+FUNCTION { find.firstletter }
+{ author empty$
+    { editor empty$
+%        { organization empty$
+          { "Nor author, editor neither organization for entry " cite$ * warning$ }
+%          { organization.find.first.letter
+%            { first.letter.ascii #64 > first.letter.ascii #91 < and
+%              first.letter.ascii #96 > first.letter.ascii #123 < and or not }
+%            { first.letter.place #1 + 'first.letter.place :=
+%              organization.find.first.letter }
+%          while$ }
+%          if$ }
+        { editor.find.first.letter
+          { first.letter.ascii #64 > first.letter.ascii #91 < and
+            first.letter.ascii #96 > first.letter.ascii #123 < and or not }
+          { first.letter.place #1 + 'first.letter.place :=
+            editor.find.first.letter }
+        while$
+        }
+      if$
+    }
+    { author.find.first.letter
+      { first.letter.ascii #64 > first.letter.ascii #91 < and
+        first.letter.ascii #96 > first.letter.ascii #123 < and or not }
+      { first.letter.place #1 + 'first.letter.place :=
+        author.find.first.letter }
+    while$
+    }
+  if$
+  #1 'first.letter.place :=
+}
+
+INTEGERS { nameptr namesleft numnames }
+
+FUNCTION {format.names}
+{ 's :=
+  #1 'nameptr :=
+  s num.names$ 'numnames :=
+  numnames 'namesleft :=
+    { namesleft #0 > }
+    { s nameptr "{vv~}{ll}{, jj}{, f.}" format.name$ 't :=   % last name first
+      nameptr #1 >
+	{ namesleft #1 >
+	    { ", " * t * }
+	    { numnames #2 >
+		{ "," * }
+		'skip$
+	      if$
+	      t "others" =
+		{ " et~al." * }
+		{ " and " * t * }
+	      if$
+	    }
+	  if$
+	}
+	't
+      if$
+      nameptr #1 + 'nameptr :=
+      namesleft #1 - 'namesleft :=
+    }
+  while$
+}
+
+FUNCTION {format.authors}
+{ author empty$
+    { "" }
+    { author format.names }
+  if$
+}
+
+FUNCTION {format.key}			% this function is just for apalike
+{ empty$
+    { key field.or.null }
+    { "" }
+  if$
+}
+
+FUNCTION {format.editors}
+{ editor empty$
+    { "" }
+    { editor format.names
+      editor num.names$ #1 >
+	{ ", editors" * }
+	{ ", editor" * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.title}
+{ title empty$
+    { "" }
+    { title "t" change.case$ }
+  if$
+}
+
+FUNCTION {n.dashify}
+{ 't :=
+  ""
+    { t empty$ not }
+    { t #1 #1 substring$ "-" =
+	{ t #1 #2 substring$ "--" = not
+	    { "--" *
+	      t #2 global.max$ substring$ 't :=
+	    }
+	    {   { t #1 #1 substring$ "-" = }
+		{ "-" *
+		  t #2 global.max$ substring$ 't :=
+		}
+	      while$
+	    }
+	  if$
+	}
+	{ t #1 #1 substring$ *
+	  t #2 global.max$ substring$ 't :=
+	}
+      if$
+    }
+  while$
+}
+
+FUNCTION {format.btitle}
+{ title emphasize
+}
+
+FUNCTION {tie.or.space.connect}
+{ duplicate$ text.length$ #3 <
+    { "~" }
+    { " " }
+  if$
+  swap$ * *
+}
+
+FUNCTION {either.or.check}
+{ empty$
+    'pop$
+    { "can't use both " swap$ * " fields in " * cite$ * warning$ }
+  if$
+}
+
+FUNCTION {format.bvolume}
+{ volume empty$
+    { "" }
+    { "volume" volume tie.or.space.connect
+      series empty$
+	'skip$
+	{ " of " * series emphasize * }
+      if$
+      "volume and number" number either.or.check
+    }
+  if$
+}
+
+FUNCTION {format.number.series}
+{ volume empty$
+    { number empty$
+	{ series field.or.null }
+	{ output.state mid.sentence =
+	    { "number" }
+	    { "Number" }
+	  if$
+	  number tie.or.space.connect
+	  series empty$
+	    { "there's a number but no series in " cite$ * warning$ }
+	    { " in " * series * }
+	  if$
+	}
+      if$
+    }
+    { "" }
+  if$
+}
+
+FUNCTION {format.edition}
+{ edition empty$
+    { "" }
+    { output.state mid.sentence =
+	{ edition "l" change.case$ " edition" * }
+	{ edition "t" change.case$ " edition" * }
+      if$
+    }
+  if$
+}
+
+INTEGERS { multiresult }
+
+FUNCTION {multi.page.check}
+{ 't :=
+  #0 'multiresult :=
+    { multiresult not
+      t empty$ not
+      and
+    }
+    { t #1 #1 substring$
+      duplicate$ "-" =
+      swap$ duplicate$ "," =
+      swap$ "+" =
+      or or
+	{ #1 'multiresult := }
+	{ t #2 global.max$ substring$ 't := }
+      if$
+    }
+  while$
+  multiresult
+}
+
+FUNCTION {format.pages}
+{ pages empty$
+    { "" }
+    { pages multi.page.check
+	{ "pages" pages n.dashify tie.or.space.connect }
+	{ "page" pages tie.or.space.connect }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.vol.num.pages}
+{ volume field.or.null
+  number empty$
+    'skip$
+    { "(" number * ")" * *
+      volume empty$
+	{ "there's a number but no volume in " cite$ * warning$ }
+	'skip$
+      if$
+    }
+  if$
+  pages empty$
+    'skip$
+    { duplicate$ empty$
+	{ pop$ format.pages }
+	{ ":" * pages n.dashify * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.chapter.pages}
+{ chapter empty$
+    'format.pages
+    { type empty$
+	{ "chapter" }
+	{ type "l" change.case$ }
+      if$
+      chapter tie.or.space.connect
+      pages empty$
+	'skip$
+	{ ", " * format.pages * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.in.ed.booktitle}
+{ booktitle empty$
+    { "" }
+    { editor empty$
+	{ "In " booktitle emphasize * }
+	{ "In " format.editors * ", " * booktitle emphasize * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.thesis.type}
+{ type empty$
+    'skip$
+    { pop$
+      type "t" change.case$
+    }
+  if$
+}
+
+FUNCTION {format.tr.number}
+{ type empty$
+    { "Technical Report" }
+    'type
+  if$
+  number empty$
+    { "t" change.case$ }
+    { number tie.or.space.connect }
+  if$
+}
+
+FUNCTION {format.article.crossref}
+{ "In"							% this is for apalike
+  " \cite{" * crossref * "}" *
+}
+
+FUNCTION {format.book.crossref}
+{ volume empty$
+    { "empty volume in " cite$ * "'s crossref of " * crossref * warning$
+      "In "
+    }
+    { "Volume" volume tie.or.space.connect
+      " of " *
+    }
+  if$
+  "\cite{" * crossref * "}" *				% this is for apalike
+}
+
+FUNCTION {format.incoll.inproc.crossref}
+{ "In"							% this is for apalike
+  " \cite{" * crossref * "}" *
+}
+
+FUNCTION {article}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  author format.key output				% special for
+  output.year.check					% apalike
+  new.block
+  format.title "title" output.check
+  new.block
+  crossref missing$
+    { journal emphasize "journal" output.check
+      format.vol.num.pages output
+    }
+    { format.article.crossref output.nonnull
+      format.pages output
+    }
+  if$
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {book}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  author empty$
+    { format.editors "author and editor" output.check
+      editor format.key output
+    }
+    { format.authors output.nonnull
+      crossref missing$
+	{ "author and editor" editor either.or.check }
+	'skip$
+      if$
+    }
+  if$
+  output.year.check				% special for apalike
+  new.block
+  format.btitle "title" output.check
+  crossref missing$
+    { format.bvolume output
+      new.block
+      format.number.series output
+      new.sentence
+      publisher "publisher" output.check
+      address output
+    }
+    { new.block
+      format.book.crossref output.nonnull
+    }
+  if$
+  format.edition output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {booklet}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors output
+  author format.key output				% special for
+  output.year.check					% apalike
+  new.block
+  format.title "title" output.check
+  new.block
+  howpublished output
+  address output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {inbook}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  author empty$
+    { format.editors "author and editor" output.check
+      editor format.key output
+    }
+    { format.authors output.nonnull
+      crossref missing$
+	{ "author and editor" editor either.or.check }
+	'skip$
+      if$
+    }
+  if$
+  output.year.check				% special for apalike
+  new.block
+  format.btitle "title" output.check
+  crossref missing$
+    { format.bvolume output
+      format.chapter.pages "chapter and pages" output.check
+      new.block
+      format.number.series output
+      new.sentence
+      publisher "publisher" output.check
+      address output
+    }
+    { format.chapter.pages "chapter and pages" output.check
+      new.block
+      format.book.crossref output.nonnull
+    }
+  if$
+  format.edition output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {incollection}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  author format.key output				% special for
+  output.year.check					% apalike
+  new.block
+  format.title "title" output.check
+  new.block
+  crossref missing$
+    { format.in.ed.booktitle "booktitle" output.check
+      format.bvolume output
+      format.number.series output
+      format.chapter.pages output
+      new.sentence
+      publisher "publisher" output.check
+      address output
+      format.edition output
+    }
+    { format.incoll.inproc.crossref output.nonnull
+      format.chapter.pages output
+    }
+  if$
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {inproceedings}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  author format.key output				% special for
+  output.year.check					% apalike
+  new.block
+  format.title "title" output.check
+  new.block
+  crossref missing$
+    { format.in.ed.booktitle "booktitle" output.check
+      format.bvolume output
+      format.number.series output
+      format.pages output
+      address output					% for apalike
+      new.sentence					% there's no year
+      organization output				% here so things
+      publisher output					% are simpler
+    }
+    { format.incoll.inproc.crossref output.nonnull
+      format.pages output
+    }
+  if$
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {conference} { inproceedings }
+
+FUNCTION {manual}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors output
+  author format.key output				% special for
+  output.year.check					% apalike
+  new.block
+  format.btitle "title" output.check
+  organization address new.block.checkb
+  organization output
+  address output
+  format.edition output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {mastersthesis}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  author format.key output				% special for
+  output.year.check					% apalike
+  new.block
+  format.title "title" output.check
+  new.block
+  "Master's thesis" format.thesis.type output.nonnull
+  school "school" output.check
+  address output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {misc}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors output
+  author format.key output				% special for
+  output.year.check					% apalike
+  new.block
+  format.title output
+  new.block
+  howpublished output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {phdthesis}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  author format.key output				% special for
+  output.year.check					% apalike
+  new.block
+  format.btitle "title" output.check
+  new.block
+  "PhD thesis" format.thesis.type output.nonnull
+  school "school" output.check
+  address output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {proceedings}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.editors output
+  editor format.key output				% special for
+  output.year.check					% apalike
+  new.block
+  format.btitle "title" output.check
+  format.bvolume output
+  format.number.series output
+  address output				% for apalike
+  new.sentence					% we always output
+  organization output				% a nonempty organization
+  publisher output				% here
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {techreport}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  author format.key output				% special for
+  output.year.check					% apalike
+  new.block
+  format.title "title" output.check
+  new.block
+  format.tr.number output.nonnull
+  institution "institution" output.check
+  address output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {unpublished}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  author format.key output				% special for
+  output.year.check					% apalike
+  new.block
+  format.title "title" output.check
+  new.block
+  note "note" output.check
+  fin.entry
+}
+
+FUNCTION {default.type} { misc }
+
+MACRO {jan} {"January"}
+
+MACRO {feb} {"February"}
+
+MACRO {mar} {"March"}
+
+MACRO {apr} {"April"}
+
+MACRO {may} {"May"}
+
+MACRO {jun} {"June"}
+
+MACRO {jul} {"July"}
+
+MACRO {aug} {"August"}
+
+MACRO {sep} {"September"}
+
+MACRO {oct} {"October"}
+
+MACRO {nov} {"November"}
+
+MACRO {dec} {"December"}
+
+MACRO {acmcs} {"ACM Computing Surveys"}
+
+MACRO {acta} {"Acta Informatica"}
+
+MACRO {cacm} {"Communications of the ACM"}
+
+MACRO {ibmjrd} {"IBM Journal of Research and Development"}
+
+MACRO {ibmsj} {"IBM Systems Journal"}
+
+MACRO {ieeese} {"IEEE Transactions on Software Engineering"}
+
+MACRO {ieeetc} {"IEEE Transactions on Computers"}
+
+MACRO {ieeetcad}
+ {"IEEE Transactions on Computer-Aided Design of Integrated Circuits"}
+
+MACRO {ipl} {"Information Processing Letters"}
+
+MACRO {jacm} {"Journal of the ACM"}
+
+MACRO {jcss} {"Journal of Computer and System Sciences"}
+
+MACRO {scp} {"Science of Computer Programming"}
+
+MACRO {sicomp} {"SIAM Journal on Computing"}
+
+MACRO {tocs} {"ACM Transactions on Computer Systems"}
+
+MACRO {tods} {"ACM Transactions on Database Systems"}
+
+MACRO {tog} {"ACM Transactions on Graphics"}
+
+MACRO {toms} {"ACM Transactions on Mathematical Software"}
+
+MACRO {toois} {"ACM Transactions on Office Information Systems"}
+
+MACRO {toplas} {"ACM Transactions on Programming Languages and Systems"}
+
+MACRO {tcs} {"Theoretical Computer Science"}
+
+READ
+
+FUNCTION {sortify}
+{ purify$
+  "l" change.case$
+}
+
+INTEGERS { len }
+
+FUNCTION {chop.word}
+{ 's :=
+  'len :=
+  s #1 len substring$ =
+    { s len #1 + global.max$ substring$ }
+    's
+  if$
+}
+
+%			There are three apalike cases: one person (Jones),
+%			two (Jones and de~Bruijn), and more (Jones et~al.).
+%			This function is much like format.crossref.editors.
+%
+FUNCTION {format.lab.names}
+{ 's :=
+  s #1 "{vv~}{ll}" format.name$
+  s num.names$ duplicate$
+  #2 >
+    { pop$ " et~al." * }
+    { #2 <
+	'skip$
+	{ s #2 "{ff }{vv }{ll}{ jj}" format.name$ "others" =
+	    { " et~al." * }
+	    { " and " * s #2 "{vv~}{ll}" format.name$ * }
+	  if$
+	}
+      if$
+    }
+  if$
+}
+
+FUNCTION {author.key.label}
+{ author empty$
+    { key empty$
+	{ cite$ #1 #3 substring$ }
+	'key					% apalike uses the whole key
+      if$
+    }
+    { author format.lab.names }
+  if$
+}
+
+FUNCTION {author.editor.key.label}
+{ author empty$
+    { editor empty$
+	{ key empty$
+	    { cite$ #1 #3 substring$ }
+	    'key				% apalike uses the whole key
+	  if$
+	}
+	{ editor format.lab.names }
+      if$
+    }
+    { author format.lab.names }
+  if$
+}
+
+FUNCTION {editor.key.label}
+{ editor empty$
+    { key empty$
+	{ cite$ #1 #3 substring$ }
+	'key			% apalike uses the whole key, no organization
+      if$
+    }
+    { editor format.lab.names }
+  if$
+}
+
+FUNCTION {calc.label}
+{ type$ "book" =
+  type$ "inbook" =
+  or
+    'author.editor.key.label
+    { type$ "proceedings" =
+	'editor.key.label			% apalike ignores organization
+	'author.key.label			% for labeling and sorting
+      if$
+    }
+  if$
+  ", "							% these three lines are
+  *							% for apalike, which
+  year field.or.null purify$ #-1 #4 substring$		% uses all four digits
+  *
+  'label :=
+}
+
+FUNCTION {sort.format.names}
+{ 's :=
+  #1 'nameptr :=
+  ""
+  s num.names$ 'numnames :=
+  numnames 'namesleft :=
+    { namesleft #0 > }
+    { nameptr #1 >
+	{ "   " * }
+	'skip$
+      if$						% apalike uses initials
+      s nameptr "{vv{ } }{ll{ }}{  f{ }}{  jj{ }}" format.name$ 't := % <= here
+      nameptr numnames = t "others" = and
+	{ "et al" * }
+	{ t sortify * }
+      if$
+      nameptr #1 + 'nameptr :=
+      namesleft #1 - 'namesleft :=
+    }
+  while$
+}
+
+FUNCTION {sort.format.title}
+{ 't :=
+  "A " #2
+    "An " #3
+      "The " #4 t chop.word
+    chop.word
+  chop.word
+  sortify
+  #1 global.max$ substring$
+}
+
+FUNCTION {author.sort}
+{ author empty$
+    { key empty$
+	{ "to sort, need author or key in " cite$ * warning$
+	  ""
+	}
+	{ key sortify }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+
+FUNCTION {author.editor.sort}
+{ author empty$
+    { editor empty$
+	{ key empty$
+	    { "to sort, need author, editor, or key in " cite$ * warning$
+	      ""
+	    }
+	    { key sortify }
+	  if$
+	}
+	{ editor sort.format.names }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+
+FUNCTION {editor.sort}
+{ editor empty$
+    { key empty$
+	{ "to sort, need editor or key in " cite$ * warning$
+	  ""
+	}
+	{ key sortify }
+      if$
+    }
+    { editor sort.format.names }
+  if$
+}
+
+%			apalike uses two sorting passes; the first one sets the
+%			labels so that the `a's, `b's, etc. can be computed;
+%			the second pass puts the references in "correct" order.
+%			The presort function is for the first pass. It computes
+%			label, sort.label, and title, and then concatenates.
+FUNCTION {presort}
+{ calc.label
+  label sortify
+  "    "
+  *
+  type$ "book" =
+  type$ "inbook" =
+  or
+    'author.editor.sort
+    { type$ "proceedings" =
+	'editor.sort
+	'author.sort
+      if$
+    }
+  if$
+  #1 entry.max$ substring$	% for
+  'sort.label :=		% apalike
+  sort.label			% style
+  *
+  "    "
+  *
+  title field.or.null
+  sort.format.title
+  *
+  #1 entry.max$ substring$
+  'sort.key$ :=
+}
+
+ITERATE {presort}
+
+SORT		% by label, sort.label, title---for final label calculation
+
+STRINGS { last.label next.extra }	% apalike labels are only for the text;
+
+INTEGERS { last.extra.num }		% there are none in the bibliography
+
+FUNCTION {initialize.extra.label.stuff}	% and hence there is no `longest.label'
+{ #0 int.to.chr$ 'last.label :=
+  "\" 'cur.letter :=
+  #1 'first.letter.place :=
+  "" 'next.extra :=
+  #0 'last.extra.num :=
+}
+
+FUNCTION { def.alphabibitem }
+{ "\def\alphabibitem#1{%" write$ newline$
+  "\expandafter\ifx\csname firstalphabibitem\endcsname" write$ newline$
+  "\relax\def\firstalphabibitem{}" write$ newline$
+  "\else\expandafter" write$ newline$
+  "\ifx\csname alphabibitemskip\endcsname" write$ newline$
+  "\relax\bigskip" write$ newline$
+  "\else\alphabibitemskip" write$ newline$
+  "\fi" write$ newline$
+  "\fi" write$ newline$
+  "\penalty-200\expandafter" write$ newline$
+  "\ifx\csname alphabibitemlabel\endcsname" write$ newline$
+  "\relax\expandafter" write$ newline$
+  "\ifx\csname alphabibitemcontent\endcsname\relax" write$ newline$
+  "\item[\LARGE\bfseries\MakeUppercase{#1}]" write$ newline$
+  "\hfill\vskip 1ex\hrule\medskip" write$ newline$
+  "\else\item[\Large\bfseries\MakeUppercase{#1}]" write$ newline$
+  "\alphabibitemcontent{\MakeUppercase{#1}}%" write$ newline$
+  "\fi" write$ newline$
+  "\else\expandafter" write$ newline$
+  "\ifx\csname alphabibitemcontent\endcsname\relax" write$ newline$
+  "\item[\alphabibitemlabel{\MakeUppercase{#1}}]" write$ newline$
+  "\vskip 1ex\hrule\medskip" write$ newline$
+  "\else\item[\alphabibitemlabel{\MakeUppercase{#1}}]" write$ newline$
+  "\alphabibitemcontent{\MakeUppercase{#1}}%" write$ newline$
+  "\fi" write$ newline$
+  "\fi}" write$ newline$
+   newline$
+}
+
+FUNCTION {forward.pass}
+{ last.label label =
+    { last.extra.num #1 + 'last.extra.num :=
+      last.extra.num int.to.chr$ 'extra.label :=
+    }
+    { "a" chr.to.int$ 'last.extra.num :=
+      "" 'extra.label :=
+      label 'last.label :=
+    }
+  if$
+}
+
+FUNCTION {reverse.pass}
+{ next.extra "b" =
+    { "a" 'extra.label := }
+    'skip$
+  if$
+  label extra.label * 'label :=
+  extra.label 'next.extra :=
+}
+
+EXECUTE {initialize.extra.label.stuff}
+
+ITERATE {forward.pass}
+
+REVERSE {reverse.pass}
+
+%				Now that the label is right we sort for real,
+%				on sort.label then year then title.  This is
+%				for the second sorting pass.
+FUNCTION {bib.sort.order}
+{ sort.label
+  "    "
+  *
+  year field.or.null sortify
+  *
+  "    "
+  *
+  title field.or.null
+  sort.format.title
+  *
+  #1 entry.max$ substring$
+  'sort.key$ :=
+}
+
+ITERATE {bib.sort.order}
+
+SORT		% by sort.label, year, title---giving final bibliography order
+
+FUNCTION {begin.bib}
+{ preamble$ empty$				% no \etalchar in apalike
+    'skip$
+    { preamble$ write$ newline$ }
+  if$
+  def.alphabibitem
+  "\begin{thebibliography}{}" write$ newline$		% no labels in apalike
+}
+
+EXECUTE {begin.bib}
+
+EXECUTE {init.state.consts}
+
+ITERATE {call.type$}
+
+FUNCTION {end.bib}
+{ newline$
+  "\end{thebibliography}" write$ newline$
+}
+
+EXECUTE {end.bib}
diff --git a/Master/texmf-dist/bibtex/bst/sort-by-letters/frplainnat-letters.bst b/Master/texmf-dist/bibtex/bst/sort-by-letters/frplainnat-letters.bst
new file mode 100644
index 00000000000..e3f192fad07
--- /dev/null
+++ b/Master/texmf-dist/bibtex/bst/sort-by-letters/frplainnat-letters.bst
@@ -0,0 +1,1471 @@
+%% File: `frplainnat-letters.bst'
+%%
+%% This program can be redistributed and/or modified under the terms
+%% of the LaTeX Project Public License Distributed from CTAN
+%% archives in directory macros/latex/base/lppl.txt; either
+%% version 1 of the License, or any later version.
+%%
+%% A modification of `plain.bst' for use with natbib package 
+%% Copyright 1993-2005 Patrick W Daly
+%% Max-Planck-Institut f\"ur Sonnensystemforschung
+%% Max-Planck-Str. 2
+%% D-37191 Katlenburg-Lindau
+%% Germany
+%% E-mail: daly@mps.mpg.de
+%%
+%% Modification de `plainnat.bst' du package natbib (citations "auteur-année")
+%% pour être utilisé avec le package french (incluant l'ancien frbib.sty)
+%% 
+%% - francisation des termes de la bibliographie via le package french ;
+%% - les noms d'auteurs sont en "small caps" ;
+%% - dans les citations le "et al." est en italique ;
+%%
+%% Olivier Andrieu <andrieu@oxygene.ijm.jussieu.fr>
+%%
+%% 02-11-2000
+%%
+%% (penser à renseigner les \*name s'il est besoin)
+%%
+%% Thomas van Oudenhove <vanouden@enstimac.fr>
+%%
+%% Modifications du 25-11-2003
+%%
+%% - mettre les particules en "small caps" (van, de, ...)
+%%     (fonctions format.names, format.full.names, format.lab.names)
+%% - enlever la dernière virgule d'une liste d'auteurs
+%%     (L. 202, numnames => nameleft)
+%% - \textit => \emph (abbréviations latines)
+%%
+%% Modifications du 20-04-2006
+%%
+%% - ajouts des fonctions find.firstletter, editor.find.first.letter,
+%%   organization.find.first.letter, author.find.first.letter et 
+%%   output.letter
+%% - pour créer une biblio avec les lettres séparant chaque "auteur"
+%%   dont le nom commence par la même lettre
+%% - Attention : les entrées DOIVENT avoir un 'author', un 'editor'
+%%   ou une 'organization'
+%% - la définition de \alphabibitem est l'oeuvre de Mael Hilléreau
+%%   <mael.hillereau@free.fr> - merci de m'avoir donné l'autorisation
+%%   de la reproduire ici.
+ENTRY
+  { address
+    author
+    booktitle
+    chapter
+    edition
+    editor
+    howpublished
+    institution
+    isbn
+    issn
+    journal
+    key
+    month
+    note
+    number
+    organization
+    pages
+    publisher
+    school
+    series
+    title
+    type
+    url
+    volume
+    year
+  }
+  {}
+  { label extra.label sort.label short.list }
+
+INTEGERS { output.state before.all mid.sentence after.sentence after.block }
+
+FUNCTION {init.state.consts}
+{ #0 'before.all :=
+  #1 'mid.sentence :=
+  #2 'after.sentence :=
+  #3 'after.block :=
+}
+
+STRINGS { s t cur.letter first.letter }
+INTEGERS { first.letter.place first.letter.ascii }
+
+FUNCTION {output.nonnull}
+{ 's :=
+  output.state mid.sentence =
+    { ", " * write$ }
+    { output.state after.block =
+        { add.period$ write$
+          newline$
+          "\newblock " write$
+        }
+        { output.state before.all =
+            'write$
+            { add.period$ " " * write$ }
+          if$
+        }
+      if$
+      mid.sentence 'output.state :=
+    }
+  if$
+  s
+}
+
+FUNCTION {output}
+{ duplicate$ empty$
+    'pop$
+    'output.nonnull
+  if$
+}
+
+FUNCTION {output.check}
+{ 't :=
+  duplicate$ empty$
+    { pop$ "empty " t * " in " * cite$ * warning$ }
+    'output.nonnull
+  if$
+}
+
+FUNCTION {fin.entry}
+{ add.period$
+  write$
+  newline$
+}
+
+FUNCTION {new.block}
+{ output.state before.all =
+    'skip$
+    { after.block 'output.state := }
+  if$
+}
+
+FUNCTION {new.sentence}
+{ output.state after.block =
+    'skip$
+    { output.state before.all =
+        'skip$
+        { after.sentence 'output.state := }
+      if$
+    }
+  if$
+}
+
+FUNCTION {not}
+{   { #0 }
+    { #1 }
+  if$
+}
+
+FUNCTION {and}
+{   'skip$
+    { pop$ #0 }
+  if$
+}
+
+FUNCTION {or}
+{   { pop$ #1 }
+    'skip$
+  if$
+}
+
+FUNCTION {new.block.checka}
+{ empty$
+    'skip$
+    'new.block
+  if$
+}
+
+FUNCTION {new.block.checkb}
+{ empty$
+  swap$ empty$
+  and
+    'skip$
+    'new.block
+  if$
+}
+
+FUNCTION {new.sentence.checka}
+{ empty$
+    'skip$
+    'new.sentence
+  if$
+}
+
+FUNCTION {new.sentence.checkb}
+{ empty$
+  swap$ empty$
+  and
+    'skip$
+    'new.sentence
+  if$
+}
+
+FUNCTION {field.or.null}
+{ duplicate$ empty$
+    { pop$ "" }
+    'skip$
+  if$
+}
+
+FUNCTION {emphasize}
+{ duplicate$ empty$
+    { pop$ "" }
+    { "{\em " swap$ * "}" * }
+  if$
+}
+
+INTEGERS { nameptr namesleft numnames }
+
+FUNCTION { author.find.first.letter }
+{ author #1 "{vv }{ll }{ff }, {jj }" format.name$ "u" change.case$
+  purify$ first.letter.place #1 substring$ 'first.letter := 
+  first.letter chr.to.int$ 'first.letter.ascii :=
+}
+
+FUNCTION { editor.find.first.letter }
+{ editor #1 "{vv }{ll }{ff }, {jj }" format.name$ "u" change.case$ 
+  purify$ first.letter.place #1 substring$ 'first.letter :=
+  first.letter chr.to.int$ 'first.letter.ascii :=
+}
+
+FUNCTION { organization.find.first.letter }
+{ organization #1 "{vv }{ll }{ff }, {jj }" format.name$ "u" change.case$
+  purify$ first.letter.place #1 substring$ 'first.letter := 
+  first.letter chr.to.int$ 'first.letter.ascii :=
+}
+
+FUNCTION { find.firstletter }
+{ author empty$
+    { editor empty$
+%        { organization empty$
+          { "Nor author, editor neither organization for entry " cite$ * warning$ }
+%          { organization.find.first.letter
+%            { first.letter.ascii #64 > first.letter.ascii #91 < and
+%              first.letter.ascii #96 > first.letter.ascii #123 < and or not }
+%            { first.letter.place #1 + 'first.letter.place :=
+%              organization.find.first.letter }
+%          while$ }
+%          if$ }
+        { editor.find.first.letter
+          { first.letter.ascii #64 > first.letter.ascii #91 < and
+            first.letter.ascii #96 > first.letter.ascii #123 < and or not }
+          { first.letter.place #1 + 'first.letter.place :=
+            editor.find.first.letter }
+        while$
+        }
+      if$
+    }
+    { author.find.first.letter
+      { first.letter.ascii #64 > first.letter.ascii #91 < and
+        first.letter.ascii #96 > first.letter.ascii #123 < and or not }
+      { first.letter.place #1 + 'first.letter.place :=
+        author.find.first.letter }
+    while$
+    }
+  if$
+  #1 'first.letter.place :=
+}
+
+FUNCTION {format.names}
+{ 's :=
+  #1 'nameptr :=
+  s num.names$ 'numnames :=
+  numnames 'namesleft :=
+    { namesleft #0 > }
+    { s nameptr "{ff~}\bsc\bgroup {vv~}{ll}\egroup{{}}{, jj}" format.name$ 't :=
+      nameptr #1 >
+        { namesleft #1 >
+            { ", " * t * }
+            { namesleft #2 >
+                { ", " * }
+                'skip$
+              if$
+              t "others" =
+                { " \emph{et~al.}" * }
+                { " \andname{} " * t * }
+              if$
+            }
+          if$
+        }
+        't
+      if$
+      nameptr #1 + 'nameptr :=
+      namesleft #1 - 'namesleft :=
+    }
+  while$
+}
+
+FUNCTION {format.key}
+{ empty$
+    { key field.or.null }
+    { "" }
+  if$
+}
+
+FUNCTION {format.authors}
+{ author empty$
+    { "" }
+    { author format.names }
+  if$
+}
+
+FUNCTION {format.editors}
+{ editor empty$
+    { "" }
+    { editor format.names
+      editor num.names$ #1 >
+        { ", \editornames{}" * }
+        { ", \editorname{}" * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.isbn}
+{ isbn empty$
+    { "" }
+    { new.block "ISBN " isbn * }
+  if$
+}
+
+FUNCTION {format.issn}
+{ issn empty$
+    { "" }
+    { new.block "ISSN " issn * }
+  if$
+}
+
+%%FUNCTION {format.url}
+%%{ url empty$
+%%    { "" }
+%%    { new.block "URL " url * }
+%%  if$
+%%}
+
+FUNCTION {format.title}
+{ title empty$
+    { "" }
+    { title "t" change.case$ }
+  if$
+}
+
+FUNCTION {format.full.names}
+{'s :=
+  #1 'nameptr :=
+  s num.names$ 'numnames :=
+  numnames 'namesleft :=
+    { namesleft #0 > }
+    { s nameptr
+      "\bsc\bgroup {vv~}{ll}\egroup{{}}" format.name$ 't :=
+      nameptr #1 >
+        {
+          namesleft #1 >
+            { ", " * t * }
+            {
+              numnames #2 >
+                { "," * }
+                'skip$
+              if$
+              t "others" =
+                { " \emph{et~al.}" * }
+                { " \andname{} " * t * }
+              if$
+            }
+          if$
+        }
+        't
+      if$
+      nameptr #1 + 'nameptr :=
+      namesleft #1 - 'namesleft :=
+    }
+  while$
+}
+
+FUNCTION {author.editor.full}
+{ author empty$
+    { editor empty$
+        { "" }
+        { editor format.full.names }
+      if$
+    }
+    { author format.full.names }
+  if$
+}
+
+FUNCTION {author.full}
+{ author empty$
+    { "" }
+    { author format.full.names }
+  if$
+}
+
+FUNCTION {editor.full}
+{ editor empty$
+    { "" }
+    { editor format.full.names }
+  if$
+}
+
+FUNCTION {make.full.names}
+{ type$ "book" =
+  type$ "inbook" =
+  or
+    'author.editor.full
+    { type$ "proceedings" =
+        'editor.full
+        'author.full
+      if$
+    }
+  if$
+}
+
+FUNCTION {output.bibitem}
+{ newline$
+  "\bibitem[" write$
+  label write$
+  ")" make.full.names duplicate$ short.list =
+     { pop$ }
+     { * }
+   if$
+  "]{" * write$
+  cite$ write$
+  "}" write$
+  newline$
+  ""
+  before.all 'output.state :=
+}
+
+FUNCTION {output.letter}
+{ first.letter cur.letter =
+    { skip$ }
+    { newline$
+      "\alphabibitem{" first.letter * "}" * write$
+      newline$ 
+      first.letter 'cur.letter := }
+  if$
+
+  cur.letter "\" = 
+    { first.letter 'cur.letter := }
+    { skip$ }
+  if$
+
+}
+
+FUNCTION {n.dashify}
+{ 't :=
+  ""
+    { t empty$ not }
+    { t #1 #1 substring$ "-" =
+        { t #1 #2 substring$ "--" = not
+            { "--" *
+              t #2 global.max$ substring$ 't :=
+            }
+            {   { t #1 #1 substring$ "-" = }
+                { "-" *
+                  t #2 global.max$ substring$ 't :=
+                }
+              while$
+            }
+          if$
+        }
+        { t #1 #1 substring$ *
+          t #2 global.max$ substring$ 't :=
+        }
+      if$
+    }
+  while$
+}
+
+FUNCTION {format.date}
+{ year duplicate$ empty$
+    { "empty year in " cite$ * warning$
+       pop$ "" }
+    'skip$
+  if$
+  month empty$
+    'skip$
+    { month
+      " " * swap$ *
+    }
+  if$
+  extra.label *
+}
+
+FUNCTION {format.btitle}
+{ title emphasize
+}
+
+FUNCTION {tie.or.space.connect}
+{ duplicate$ text.length$ #3 <
+    { "~" }
+    { " " }
+  if$
+  swap$ * *
+}
+
+FUNCTION {either.or.check}
+{ empty$
+    'pop$
+    { "can't use both " swap$ * " fields in " * cite$ * warning$ }
+  if$
+}
+
+FUNCTION {format.bvolume}
+{ volume empty$
+    { "" }
+    { "\volumename{}" volume tie.or.space.connect
+      series empty$
+        'skip$
+        { " \ofname{} " * series emphasize * }
+      if$
+      "\volumename{} \andname{} \numbername{}" number either.or.check
+    }
+  if$
+}
+
+FUNCTION {format.number.series}
+{ volume empty$
+    { number empty$
+        { series field.or.null }
+        { output.state mid.sentence =
+            { "\numbername{}" }
+            { "\Numbername{}" }
+          if$
+          number tie.or.space.connect
+          series empty$
+            { "there's a number but no series in " cite$ * warning$ }
+            { " \inname{} " * series * }
+          if$
+        }
+      if$
+    }
+    { "" }
+  if$
+}
+
+FUNCTION {format.edition}
+{ edition empty$
+    { "" }
+    { output.state mid.sentence =
+        { edition "l" change.case$ " \editionname{}" * }
+        { edition "t" change.case$ " \editionname{}" * }
+      if$
+    }
+  if$
+}
+
+INTEGERS { multiresult }
+
+FUNCTION {multi.page.check}
+{ 't :=
+  #0 'multiresult :=
+    { multiresult not
+      t empty$ not
+      and
+    }
+    { t #1 #1 substring$
+      duplicate$ "-" =
+      swap$ duplicate$ "," =
+      swap$ "+" =
+      or or
+        { #1 'multiresult := }
+        { t #2 global.max$ substring$ 't := }
+      if$
+    }
+  while$
+  multiresult
+}
+
+FUNCTION {format.pages}
+{ pages empty$
+    { "" }
+    { pages multi.page.check
+        { "\pagesname{}" pages n.dashify tie.or.space.connect }
+        { "\pagename{}" pages tie.or.space.connect }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.vol.num.pages}
+{ volume field.or.null
+  number empty$
+    'skip$
+    { "\penalty0 (" number * ")" * *
+      volume empty$
+        { "there's a number but no volume in " cite$ * warning$ }
+        'skip$
+      if$
+    }
+  if$
+  pages empty$
+    'skip$
+    { duplicate$ empty$
+        { pop$ format.pages }
+        { "\string:\penalty0 " * pages n.dashify * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.chapter.pages}
+{ chapter empty$
+    'format.pages
+    { type empty$
+        { "\chaptername{}" }
+        { type "l" change.case$ }
+      if$
+      chapter tie.or.space.connect
+      pages empty$
+        'skip$
+        { ", " * format.pages * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.in.ed.booktitle}
+{ booktitle empty$
+    { "" }
+    { editor empty$
+        { "\Inname{} " booktitle emphasize * }
+        { "\Inname{} " format.editors * ", " * booktitle emphasize * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {empty.misc.check}
+{ author empty$ title empty$ howpublished empty$
+  month empty$ year empty$ note empty$
+  and and and and and
+  key empty$ not and
+    { "all relevant fields are empty in " cite$ * warning$ }
+    'skip$
+  if$
+}
+
+FUNCTION {format.thesis.type}
+{ type empty$
+    'skip$
+    { pop$
+      type "t" change.case$
+    }
+  if$
+}
+
+FUNCTION {format.tr.number}
+{ type empty$
+    { "\technicalreportname{}" }
+    'type
+  if$
+  number empty$
+    { "t" change.case$ }
+    { number tie.or.space.connect }
+  if$
+}
+
+FUNCTION {format.article.crossref}
+{ key empty$
+    { journal empty$
+        { "need key or journal for " cite$ * " to crossref " * crossref *
+          warning$
+          ""
+        }
+        { "\Inname{} {\em " journal * "\/}" * }
+      if$
+    }
+    { "\Inname{} " key * }
+  if$
+  " \citep{" * crossref * "}" *
+}
+
+FUNCTION {format.book.crossref}
+{ volume empty$
+    { "empty volume in " cite$ * "'s crossref of " * crossref * warning$
+      "\Inname{} "
+    }
+    { "\Volumename{}" volume tie.or.space.connect
+      " of " *
+    }
+  if$
+  editor empty$
+  editor field.or.null author field.or.null =
+  or
+    { key empty$
+        { series empty$
+            { "need editor, key, or series for " cite$ * " to crossref " *
+              crossref * warning$
+              "" *
+            }
+            { "{\em " * series * "\/}" * }
+          if$
+        }
+        { key * }
+      if$
+    }
+    'skip$
+  if$
+  " \citet{" * crossref * "}" *
+}
+
+FUNCTION {format.incoll.inproc.crossref}
+{ editor empty$
+  editor field.or.null author field.or.null =
+  or
+    { key empty$
+        { booktitle empty$
+            { "need editor, key, or booktitle for " cite$ * " to crossref " *
+              crossref * warning$
+              ""
+            }
+            { "\Inname{} {\em " booktitle * "\/}" * }
+          if$
+        }
+        { "\Inname{} " key * }
+      if$
+    }
+    { "\Inname{} " }
+  if$
+  " \citet{" * crossref * "}" *
+}
+
+FUNCTION {article}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  author format.key output
+  new.block
+  format.title "title" output.check
+  new.block
+  crossref missing$
+    { journal emphasize "journal" output.check
+      format.vol.num.pages output
+      format.date "year" output.check
+    }
+    { format.article.crossref output.nonnull
+      format.pages output
+    }
+  if$
+  format.issn output
+%  url output
+  fin.entry
+}
+
+FUNCTION {book}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  author empty$
+    { format.editors "author and editor" output.check
+      editor format.key output
+    }
+    { format.authors output.nonnull
+      crossref missing$
+        { "author and editor" editor either.or.check }
+        'skip$
+      if$
+    }
+  if$
+  new.block
+  format.btitle "title" output.check
+  crossref missing$
+    { format.bvolume output
+      new.block
+      format.number.series output
+      new.sentence
+      publisher "publisher" output.check
+      address output
+    }
+    { new.block
+      format.book.crossref output.nonnull
+    }
+  if$
+  format.edition output
+  format.date "year" output.check
+  format.isbn output
+%  url output
+  fin.entry
+}
+
+FUNCTION {booklet}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors output
+  author format.key output
+  new.block
+  format.title "title" output.check
+  howpublished address new.block.checkb
+  howpublished output
+  address output
+  format.date output
+  format.isbn output
+%  url output
+  fin.entry
+}
+
+FUNCTION {inbook}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  author empty$
+    { format.editors "author and editor" output.check
+      editor format.key output
+    }
+    { format.authors output.nonnull
+      crossref missing$
+        { "author and editor" editor either.or.check }
+        'skip$
+      if$
+    }
+  if$
+  new.block
+  format.btitle "title" output.check
+  crossref missing$
+    { format.bvolume output
+      format.chapter.pages "chapter and pages" output.check
+      new.block
+      format.number.series output
+      new.sentence
+      publisher "publisher" output.check
+      address output
+    }
+    { format.chapter.pages "chapter and pages" output.check
+      new.block
+      format.book.crossref output.nonnull
+    }
+  if$
+  format.edition output
+  format.date "year" output.check
+  format.isbn output
+%  url output
+  fin.entry
+}
+
+FUNCTION {incollection}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  author format.key output
+  new.block
+  format.title "title" output.check
+  new.block
+  crossref missing$
+    { format.in.ed.booktitle "booktitle" output.check
+      format.bvolume output
+      format.number.series output
+      format.chapter.pages output
+      new.sentence
+      publisher "publisher" output.check
+      address output
+      format.edition output
+      format.date "year" output.check
+    }
+    { format.incoll.inproc.crossref output.nonnull
+      format.chapter.pages output
+    }
+  if$
+  format.isbn output
+%  url output
+  fin.entry
+}
+
+FUNCTION {inproceedings}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  author format.key output
+  new.block
+  format.title "title" output.check
+  new.block
+  crossref missing$
+    { format.in.ed.booktitle "booktitle" output.check
+      format.bvolume output
+      format.number.series output
+      format.pages output
+      address empty$
+        { organization publisher new.sentence.checkb
+          organization output
+          publisher output
+          format.date "year" output.check
+        }
+        { address output.nonnull
+          format.date "year" output.check
+          new.sentence
+          organization output
+          publisher output
+        }
+      if$
+    }
+    { format.incoll.inproc.crossref output.nonnull
+      format.pages output
+    }
+  if$
+  format.isbn output
+%  url output
+  fin.entry
+}
+
+FUNCTION {conference} { inproceedings }
+
+FUNCTION {manual}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors output
+  author format.key output
+  new.block
+  format.btitle "title" output.check
+  organization address new.block.checkb
+  organization output
+  address output
+  format.edition output
+  format.date output
+%  url output
+  fin.entry
+}
+
+FUNCTION {mastersthesis}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  author format.key output
+  new.block
+  format.title "title" output.check
+  new.block
+  "Mémoire" format.thesis.type output.nonnull
+  school "school" output.check
+  address output
+  format.date "year" output.check
+%  url output
+  fin.entry
+}
+
+FUNCTION {misc}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors output
+  author format.key output
+  title howpublished new.block.checkb
+  format.title output
+  howpublished new.block.checka
+  howpublished output
+  format.date output
+  format.issn output
+%  url output
+  fin.entry
+  empty.misc.check
+}
+
+FUNCTION {phdthesis}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  author format.key output
+  new.block
+  format.btitle "title" output.check
+  new.block
+  "Thèse de doctorat" format.thesis.type output.nonnull
+  school "school" output.check
+  address output
+  format.date "year" output.check
+  fin.entry
+}
+
+FUNCTION {proceedings}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.editors output
+  editor format.key output
+  new.block
+  format.btitle "title" output.check
+  format.bvolume output
+  format.number.series output
+  address output
+  format.date "year" output.check
+  new.sentence
+  organization output
+  publisher output
+  format.isbn output
+%  url output
+  fin.entry
+}
+
+FUNCTION {techreport}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  author format.key output
+  new.block
+  format.title "title" output.check
+  new.block
+  format.tr.number output.nonnull
+  institution "institution" output.check
+  address output
+  format.date "year" output.check
+%  url output
+  fin.entry
+}
+
+FUNCTION {unpublished}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  author format.key output
+  new.block
+  format.title "title" output.check
+%  url output
+  format.date output
+  fin.entry
+}
+
+FUNCTION {default.type} { misc }
+
+MACRO {jan} {"\janname{}"}
+
+MACRO {feb} {"\febname{}"}
+
+MACRO {mar} {"\marname{}"}
+
+MACRO {apr} {"\aprname{}"}
+
+MACRO {may} {"\mayname{}"}
+
+MACRO {jun} {"\junname{}"}
+
+MACRO {jul} {"\julname{}"}
+
+MACRO {aug} {"\augname{}"}
+
+MACRO {sep} {"\sepname{}"}
+
+MACRO {oct} {"\octname{}"}
+
+MACRO {nov} {"\novname{}"}
+
+MACRO {dec} {"\decname{}"}
+
+MACRO {acmcs} {"ACM Computing Surveys"}
+
+MACRO {acta} {"Acta Informatica"}
+
+MACRO {cacm} {"Communications of the ACM"}
+
+MACRO {ibmjrd} {"IBM Journal of Research and Development"}
+
+MACRO {ibmsj} {"IBM Systems Journal"}
+
+MACRO {ieeese} {"IEEE Transactions on Software Engineering"}
+
+MACRO {ieeetc} {"IEEE Transactions on Computers"}
+
+MACRO {ieeetcad}
+ {"IEEE Transactions on Computer-Aided Design of Integrated Circuits"}
+
+MACRO {ipl} {"Information Processing Letters"}
+
+MACRO {jacm} {"Journal of the ACM"}
+
+MACRO {jcss} {"Journal of Computer and System Sciences"}
+
+MACRO {scp} {"Science of Computer Programming"}
+
+MACRO {sicomp} {"SIAM Journal on Computing"}
+
+MACRO {tocs} {"ACM Transactions on Computer Systems"}
+
+MACRO {tods} {"ACM Transactions on Database Systems"}
+
+MACRO {tog} {"ACM Transactions on Graphics"}
+
+MACRO {toms} {"ACM Transactions on Mathematical Software"}
+
+MACRO {toois} {"ACM Transactions on Office Information Systems"}
+
+MACRO {toplas} {"ACM Transactions on Programming Languages and Systems"}
+
+MACRO {tcs} {"Theoretical Computer Science"}
+
+READ
+
+FUNCTION {sortify}
+{ purify$
+  "l" change.case$
+}
+
+INTEGERS { len }
+
+FUNCTION {chop.word}
+{ 's :=
+  'len :=
+  s #1 len substring$ =
+    { s len #1 + global.max$ substring$ }
+    's
+  if$
+}
+
+FUNCTION {format.lab.names}
+{ 's :=
+  s #1 "\bsc\bgroup {vv~}{ll}\egroup{{}}" format.name$
+  s num.names$ duplicate$
+  #2 >
+    { pop$ " \emph{et~al.}" * }
+    { #2 <
+        'skip$
+        { s #2 "{ff }\bsc\bgroup {vv }{ll}\egroup{{}}{ jj}" format.name$ "others" =
+            { " \emph{et~al.}" * }
+            { " \andname{} " * s #2 "\bsc\bgroup {vv~}{ll}\egroup{{}}" format.name$ * }
+          if$
+        }
+      if$
+    }
+  if$
+}
+
+FUNCTION {author.key.label}
+{ author empty$
+    { key empty$
+        { cite$ #1 #3 substring$ }
+        'key
+      if$
+    }
+    { author format.lab.names }
+  if$
+}
+
+FUNCTION {author.editor.key.label}
+{ author empty$
+    { editor empty$
+        { key empty$
+            { cite$ #1 #3 substring$ }
+            'key
+          if$
+        }
+        { editor format.lab.names }
+      if$
+    }
+    { author format.lab.names }
+  if$
+}
+
+FUNCTION {author.key.organization.label}
+{ author empty$
+    { key empty$
+        { organization empty$
+            { cite$ #1 #3 substring$ }
+            { "The " #4 organization chop.word #3 text.prefix$ }
+          if$
+        }
+        'key
+      if$
+    }
+    { author format.lab.names }
+  if$
+}
+
+FUNCTION {editor.key.organization.label}
+{ editor empty$
+    { key empty$
+        { organization empty$
+            { cite$ #1 #3 substring$ }
+            { "The " #4 organization chop.word #3 text.prefix$ }
+          if$
+        }
+        'key
+      if$
+    }
+    { editor format.lab.names }
+  if$
+}
+
+FUNCTION {calc.short.authors}
+{ type$ "book" =
+  type$ "inbook" =
+  or
+    'author.editor.key.label
+    { type$ "proceedings" =
+        'editor.key.organization.label
+        { type$ "manual" =
+            'author.key.organization.label
+            'author.key.label
+          if$
+        }
+      if$
+    }
+  if$
+  'short.list :=
+}
+
+FUNCTION {calc.label}
+{ calc.short.authors
+  short.list
+  "("
+  *
+  year duplicate$ empty$
+  short.list key field.or.null = or
+     { pop$ "" }
+     'skip$
+  if$
+  *
+  'label :=
+}
+
+FUNCTION {sort.format.names}
+{ 's :=
+  #1 'nameptr :=
+  ""
+  s num.names$ 'numnames :=
+  numnames 'namesleft :=
+    { namesleft #0 > }
+    { nameptr #1 >
+        { "   " * }
+        'skip$
+      if$
+      s nameptr "{vv{ } }{ll{ }}{  ff{ }}{  jj{ }}" format.name$ 't :=
+      nameptr numnames = t "others" = and
+        { "\emph{et~al}" * }
+        { t sortify * }
+      if$
+      nameptr #1 + 'nameptr :=
+      namesleft #1 - 'namesleft :=
+    }
+  while$
+}
+
+FUNCTION {sort.format.title}
+{ 't :=
+  "A " #2
+    "An " #3
+      "The " #4 t chop.word
+    chop.word
+  chop.word
+  sortify
+  #1 global.max$ substring$
+}
+
+FUNCTION {author.sort}
+{ author empty$
+    { key empty$
+        { "to sort, need author or key in " cite$ * warning$
+          ""
+        }
+        { key sortify }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+
+FUNCTION {author.editor.sort}
+{ author empty$
+    { editor empty$
+        { key empty$
+            { "to sort, need author, editor, or key in " cite$ * warning$
+              ""
+            }
+            { key sortify }
+          if$
+        }
+        { editor sort.format.names }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+
+FUNCTION {author.organization.sort}
+{ author empty$
+    { organization empty$
+        { key empty$
+            { "to sort, need author, organization, or key in " cite$ * warning$
+              ""
+            }
+            { key sortify }
+          if$
+        }
+        { "The " #4 organization chop.word sortify }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+
+FUNCTION {editor.organization.sort}
+{ editor empty$
+    { organization empty$
+        { key empty$
+            { "to sort, need editor, organization, or key in " cite$ * warning$
+              ""
+            }
+            { key sortify }
+          if$
+        }
+        { "The " #4 organization chop.word sortify }
+      if$
+    }
+    { editor sort.format.names }
+  if$
+}
+
+FUNCTION {presort}
+{ calc.label
+  label sortify
+  "    "
+  *
+  type$ "book" =
+  type$ "inbook" =
+  or
+    'author.editor.sort
+    { type$ "proceedings" =
+        'editor.organization.sort
+        { type$ "manual" =
+            'author.organization.sort
+            'author.sort
+          if$
+        }
+      if$
+    }
+  if$
+  "    "
+  *
+  year field.or.null sortify
+  *
+  "    "
+  *
+  title field.or.null
+  sort.format.title
+  *
+  #1 entry.max$ substring$
+  'sort.label :=
+  sort.label *
+  #1 entry.max$ substring$
+  'sort.key$ :=
+}
+
+ITERATE {presort}
+
+SORT
+
+STRINGS { longest.label last.label next.extra }
+
+INTEGERS { longest.label.width last.extra.num number.label }
+
+FUNCTION {initialize.longest.label}
+{ "" 'longest.label :=
+  "\" 'cur.letter :=
+  #1 'first.letter.place :=
+  #0 int.to.chr$ 'last.label :=
+  "" 'next.extra :=
+  #0 'longest.label.width :=
+  #0 'last.extra.num :=
+  #0 'number.label :=
+}
+
+FUNCTION {forward.pass}
+{ last.label label =
+    { last.extra.num #1 + 'last.extra.num :=
+      last.extra.num int.to.chr$ 'extra.label :=
+    }
+    { "a" chr.to.int$ 'last.extra.num :=
+      "" 'extra.label :=
+      label 'last.label :=
+    }
+  if$
+  number.label #1 + 'number.label :=
+}
+
+FUNCTION {reverse.pass}
+{ next.extra "b" =
+    { "a" 'extra.label := }
+    'skip$
+  if$
+  extra.label 'next.extra :=
+  extra.label
+  duplicate$ empty$
+    'skip$
+    { "{\natexlab{" swap$ * "}}" * }
+  if$
+  'extra.label :=
+  label extra.label * 'label :=
+}
+
+FUNCTION { def.alphabibitem }
+{ "\def\alphabibitem#1{%" write$ newline$
+  "\expandafter\ifx\csname firstalphabibitem\endcsname" write$ newline$
+  "\relax\def\firstalphabibitem{}" write$ newline$
+  "\else\expandafter" write$ newline$
+  "\ifx\csname alphabibitemskip\endcsname" write$ newline$
+  "\relax\bigskip" write$ newline$
+  "\else\alphabibitemskip" write$ newline$
+  "\fi" write$ newline$
+  "\fi" write$ newline$
+  "\penalty-200\expandafter" write$ newline$
+  "\ifx\csname alphabibitemlabel\endcsname" write$ newline$
+  "\relax\expandafter" write$ newline$
+  "\ifx\csname alphabibitemcontent\endcsname\relax" write$ newline$
+  "\item[\LARGE\bfseries\MakeUppercase{#1}]" write$ newline$
+  "\hfill\vskip 1ex\hrule\medskip" write$ newline$
+  "\else\item[\Large\bfseries\MakeUppercase{#1}]" write$ newline$
+  "\alphabibitemcontent{\MakeUppercase{#1}}%" write$ newline$
+  "\fi" write$ newline$
+  "\else\expandafter" write$ newline$
+  "\ifx\csname alphabibitemcontent\endcsname\relax" write$ newline$
+  "\item[\alphabibitemlabel{\MakeUppercase{#1}}]" write$ newline$
+  "\vskip 1ex\hrule\medskip" write$ newline$
+  "\else\item[\alphabibitemlabel{\MakeUppercase{#1}}]" write$ newline$
+  "\alphabibitemcontent{\MakeUppercase{#1}}%" write$ newline$
+  "\fi" write$ newline$
+  "\fi}" write$ newline$
+   newline$
+}
+
+EXECUTE {initialize.longest.label}
+
+ITERATE {forward.pass}
+
+REVERSE {reverse.pass}
+
+FUNCTION {bib.sort.order}
+{ sort.label  'sort.key$ :=
+}
+
+ITERATE {bib.sort.order}
+
+SORT
+
+FUNCTION {begin.bib}
+{   preamble$ empty$
+    'skip$
+    { preamble$ write$ newline$ }
+  if$
+  def.alphabibitem
+  "\begin{thebibliography}{" number.label int.to.str$ * "}" *
+  write$ newline$
+  "\expandafter\ifx\csname natexlab\endcsname\relax\def\natexlab#1{#1}\fi"
+  write$ newline$
+  "\expandafter\ifx\csname url\endcsname\relax" write$ newline$
+  "  \def\url#1{{\tt #1}}\fi" write$ newline$
+}
+
+EXECUTE {begin.bib}
+
+EXECUTE {init.state.consts}
+
+ITERATE {call.type$}
+
+FUNCTION {end.bib}
+{ newline$
+  "\end{thebibliography}" write$ newline$
+}
+
+EXECUTE {end.bib}
diff --git a/Master/texmf-dist/bibtex/bst/sort-by-letters/plain-letters.bst b/Master/texmf-dist/bibtex/bst/sort-by-letters/plain-letters.bst
new file mode 100644
index 00000000000..47dd3d1906a
--- /dev/null
+++ b/Master/texmf-dist/bibtex/bst/sort-by-letters/plain-letters.bst
@@ -0,0 +1,1217 @@
+% BibTeX bibliography style `plain-letters'
+%% adapted from standard style `plain'
+%% (C) 2006 - Thomas van Oudenhove 
+%% when sorting by letter, write the first letter of author 
+%% or editor - bug with organization...
+
+ENTRY
+  { address
+    author
+    booktitle
+    chapter
+    edition
+    editor
+    howpublished
+    institution
+    journal
+    key
+    month
+    note
+    number
+    organization
+    pages
+    publisher
+    school
+    series
+    title
+    type
+    volume
+    year
+  }
+  {}
+  { label }
+
+INTEGERS { output.state before.all mid.sentence after.sentence after.block }
+
+FUNCTION {init.state.consts}
+{ #0 'before.all :=
+  #1 'mid.sentence :=
+  #2 'after.sentence :=
+  #3 'after.block :=
+}
+
+STRINGS { s t cur.letter first.letter }
+INTEGERS { first.letter.place first.letter.ascii }
+
+FUNCTION {output.nonnull}
+{ 's :=
+  output.state mid.sentence =
+    { ", " * write$ }
+    { output.state after.block =
+	{ add.period$ write$
+	  newline$
+	  "\newblock " write$
+	}
+	{ output.state before.all =
+	    'write$
+	    { add.period$ " " * write$ }
+	  if$
+	}
+      if$
+      mid.sentence 'output.state :=
+    }
+  if$
+  s
+}
+
+FUNCTION {output}
+{ duplicate$ empty$
+    'pop$
+    'output.nonnull
+  if$
+}
+
+FUNCTION {output.check}
+{ 't :=
+  duplicate$ empty$
+    { pop$ "empty " t * " in " * cite$ * warning$ }
+    'output.nonnull
+  if$
+}
+
+FUNCTION {output.letter}
+{ first.letter cur.letter =
+    { skip$ }
+    { newline$
+      "\alphabibitem{" first.letter * "}" * write$
+      newline$ 
+      first.letter 'cur.letter := }
+  if$
+  cur.letter "\" = 
+    { first.letter 'cur.letter := }
+    { skip$ }
+  if$
+}
+
+FUNCTION {output.bibitem}
+{ newline$
+  "\bibitem{" write$
+  cite$ write$
+  "}" write$
+  newline$
+  ""
+  before.all 'output.state :=
+}
+
+FUNCTION {fin.entry}
+{ add.period$
+  write$
+  newline$
+}
+
+FUNCTION {new.block}
+{ output.state before.all =
+    'skip$
+    { after.block 'output.state := }
+  if$
+}
+
+FUNCTION {new.sentence}
+{ output.state after.block =
+    'skip$
+    { output.state before.all =
+	'skip$
+	{ after.sentence 'output.state := }
+      if$
+    }
+  if$
+}
+
+FUNCTION {not}
+{   { #0 }
+    { #1 }
+  if$
+}
+
+FUNCTION {and}
+{   'skip$
+    { pop$ #0 }
+  if$
+}
+
+FUNCTION {or}
+{   { pop$ #1 }
+    'skip$
+  if$
+}
+
+FUNCTION {new.block.checka}
+{ empty$
+    'skip$
+    'new.block
+  if$
+}
+
+FUNCTION {new.block.checkb}
+{ empty$
+  swap$ empty$
+  and
+    'skip$
+    'new.block
+  if$
+}
+
+FUNCTION {new.sentence.checka}
+{ empty$
+    'skip$
+    'new.sentence
+  if$
+}
+
+FUNCTION {new.sentence.checkb}
+{ empty$
+  swap$ empty$
+  and
+    'skip$
+    'new.sentence
+  if$
+}
+
+FUNCTION {field.or.null}
+{ duplicate$ empty$
+    { pop$ "" }
+    'skip$
+  if$
+}
+
+FUNCTION {emphasize}
+{ duplicate$ empty$
+    { pop$ "" }
+    { "{\em " swap$ * "}" * }
+  if$
+}
+
+FUNCTION { author.find.first.letter }
+{ author #1 "{vv }{ll }{ff }, {jj }" format.name$ "u" change.case$
+  purify$ first.letter.place #1 substring$ 'first.letter := 
+  first.letter chr.to.int$ 'first.letter.ascii :=
+}
+
+FUNCTION { editor.find.first.letter }
+{ editor #1 "{vv }{ll }{ff }, {jj }" format.name$ "u" change.case$ 
+  purify$ first.letter.place #1 substring$ 'first.letter :=
+  first.letter chr.to.int$ 'first.letter.ascii :=
+}
+
+FUNCTION { organization.find.first.letter }
+{ organization #1 "{vv }{ll }{ff }, {jj }" format.name$ "u" change.case$
+  purify$ first.letter.place #1 substring$ 'first.letter := 
+  first.letter chr.to.int$ 'first.letter.ascii :=
+}
+
+FUNCTION { find.firstletter }
+{ author empty$
+    { editor empty$
+%        { organization empty$
+          { "Nor author, editor neither organization for entry " cite$ * warning$ }
+%          { organization.find.first.letter
+%            { first.letter.ascii #64 > first.letter.ascii #91 < and
+%              first.letter.ascii #96 > first.letter.ascii #123 < and or not }
+%            { first.letter.place #1 + 'first.letter.place :=
+%              organization.find.first.letter }
+%          while$ }
+%          if$ }
+        { editor.find.first.letter
+          { first.letter.ascii #64 > first.letter.ascii #91 < and
+            first.letter.ascii #96 > first.letter.ascii #123 < and or not }
+          { first.letter.place #1 + 'first.letter.place :=
+            editor.find.first.letter }
+        while$
+        }
+      if$
+    }
+    { author.find.first.letter
+      { first.letter.ascii #64 > first.letter.ascii #91 < and
+        first.letter.ascii #96 > first.letter.ascii #123 < and or not }
+      { first.letter.place #1 + 'first.letter.place :=
+        author.find.first.letter }
+    while$
+    }
+  if$
+  #1 'first.letter.place :=
+}
+
+INTEGERS { nameptr namesleft numnames }
+
+FUNCTION {format.names}
+{ 's :=
+  #1 'nameptr :=
+  s num.names$ 'numnames :=
+  numnames 'namesleft :=
+    { namesleft #0 > }
+    { s nameptr "{ff~}{vv~}{ll}{, jj}" format.name$ 't :=
+      nameptr #1 >
+	{ namesleft #1 >
+	    { ", " * t * }
+	    { numnames #2 >
+		{ "," * }
+		'skip$
+	      if$
+	      t "others" =
+		{ " et~al." * }
+		{ " and " * t * }
+	      if$
+	    }
+	  if$
+	}
+	't
+      if$
+      nameptr #1 + 'nameptr :=
+      namesleft #1 - 'namesleft :=
+    }
+  while$
+}
+
+FUNCTION {format.authors}
+{ author empty$
+    { "" }
+    { author format.names }
+  if$
+}
+
+FUNCTION {format.editors}
+{ editor empty$
+    { "" }
+    { editor format.names
+      editor num.names$ #1 >
+	{ ", editors" * }
+	{ ", editor" * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.title}
+{ title empty$
+    { "" }
+    { title "t" change.case$ }
+  if$
+}
+
+FUNCTION {n.dashify}
+{ 't :=
+  ""
+    { t empty$ not }
+    { t #1 #1 substring$ "-" =
+	{ t #1 #2 substring$ "--" = not
+	    { "--" *
+	      t #2 global.max$ substring$ 't :=
+	    }
+	    {   { t #1 #1 substring$ "-" = }
+		{ "-" *
+		  t #2 global.max$ substring$ 't :=
+		}
+	      while$
+	    }
+	  if$
+	}
+	{ t #1 #1 substring$ *
+	  t #2 global.max$ substring$ 't :=
+	}
+      if$
+    }
+  while$
+}
+
+FUNCTION {format.date}
+{ year empty$
+    { month empty$
+	{ "" }
+	{ "there's a month but no year in " cite$ * warning$
+	  month
+	}
+      if$
+    }
+    { month empty$
+	'year
+	{ month " " * year * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.btitle}
+{ title emphasize
+}
+
+FUNCTION {tie.or.space.connect}
+{ duplicate$ text.length$ #3 <
+    { "~" }
+    { " " }
+  if$
+  swap$ * *
+}
+
+FUNCTION {either.or.check}
+{ empty$
+    'pop$
+    { "can't use both " swap$ * " fields in " * cite$ * warning$ }
+  if$
+}
+
+FUNCTION {format.bvolume}
+{ volume empty$
+    { "" }
+    { "volume" volume tie.or.space.connect
+      series empty$
+	'skip$
+	{ " of " * series emphasize * }
+      if$
+      "volume and number" number either.or.check
+    }
+  if$
+}
+
+FUNCTION {format.number.series}
+{ volume empty$
+    { number empty$
+	{ series field.or.null }
+	{ output.state mid.sentence =
+	    { "number" }
+	    { "Number" }
+	  if$
+	  number tie.or.space.connect
+	  series empty$
+	    { "there's a number but no series in " cite$ * warning$ }
+	    { " in " * series * }
+	  if$
+	}
+      if$
+    }
+    { "" }
+  if$
+}
+
+FUNCTION {format.edition}
+{ edition empty$
+    { "" }
+    { output.state mid.sentence =
+	{ edition "l" change.case$ " edition" * }
+	{ edition "t" change.case$ " edition" * }
+      if$
+    }
+  if$
+}
+
+INTEGERS { multiresult }
+
+FUNCTION {multi.page.check}
+{ 't :=
+  #0 'multiresult :=
+    { multiresult not
+      t empty$ not
+      and
+    }
+    { t #1 #1 substring$
+      duplicate$ "-" =
+      swap$ duplicate$ "," =
+      swap$ "+" =
+      or or
+	{ #1 'multiresult := }
+	{ t #2 global.max$ substring$ 't := }
+      if$
+    }
+  while$
+  multiresult
+}
+
+FUNCTION {format.pages}
+{ pages empty$
+    { "" }
+    { pages multi.page.check
+	{ "pages" pages n.dashify tie.or.space.connect }
+	{ "page" pages tie.or.space.connect }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.vol.num.pages}
+{ volume field.or.null
+  number empty$
+    'skip$
+    { "(" number * ")" * *
+      volume empty$
+	{ "there's a number but no volume in " cite$ * warning$ }
+	'skip$
+      if$
+    }
+  if$
+  pages empty$
+    'skip$
+    { duplicate$ empty$
+	{ pop$ format.pages }
+	{ ":" * pages n.dashify * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.chapter.pages}
+{ chapter empty$
+    'format.pages
+    { type empty$
+	{ "chapter" }
+	{ type "l" change.case$ }
+      if$
+      chapter tie.or.space.connect
+      pages empty$
+	'skip$
+	{ ", " * format.pages * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.in.ed.booktitle}
+{ booktitle empty$
+    { "" }
+    { editor empty$
+	{ "In " booktitle emphasize * }
+	{ "In " format.editors * ", " * booktitle emphasize * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {empty.misc.check}
+{ author empty$ title empty$ howpublished empty$
+  month empty$ year empty$ note empty$
+  and and and and and
+  key empty$ not and
+    { "all relevant fields are empty in " cite$ * warning$ }
+    'skip$
+  if$
+}
+
+FUNCTION {format.thesis.type}
+{ type empty$
+    'skip$
+    { pop$
+      type "t" change.case$
+    }
+  if$
+}
+
+FUNCTION {format.tr.number}
+{ type empty$
+    { "Technical Report" }
+    'type
+  if$
+  number empty$
+    { "t" change.case$ }
+    { number tie.or.space.connect }
+  if$
+}
+
+FUNCTION {format.article.crossref}
+{ key empty$
+    { journal empty$
+	{ "need key or journal for " cite$ * " to crossref " * crossref *
+	  warning$
+	  ""
+	}
+	{ "In {\em " journal * "\/}" * }
+      if$
+    }
+    { "In " key * }
+  if$
+  " \cite{" * crossref * "}" *
+}
+
+FUNCTION {format.crossref.editor}
+{ editor #1 "{vv~}{ll}" format.name$
+  editor num.names$ duplicate$
+  #2 >
+    { pop$ " et~al." * }
+    { #2 <
+	'skip$
+	{ editor #2 "{ff }{vv }{ll}{ jj}" format.name$ "others" =
+	    { " et~al." * }
+	    { " and " * editor #2 "{vv~}{ll}" format.name$ * }
+	  if$
+	}
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.book.crossref}
+{ volume empty$
+    { "empty volume in " cite$ * "'s crossref of " * crossref * warning$
+      "In "
+    }
+    { "Volume" volume tie.or.space.connect
+      " of " *
+    }
+  if$
+  editor empty$
+  editor field.or.null author field.or.null =
+  or
+    { key empty$
+	{ series empty$
+	    { "need editor, key, or series for " cite$ * " to crossref " *
+	      crossref * warning$
+	      "" *
+	    }
+	    { "{\em " * series * "\/}" * }
+	  if$
+	}
+	{ key * }
+      if$
+    }
+    { format.crossref.editor * }
+  if$
+  " \cite{" * crossref * "}" *
+}
+
+FUNCTION {format.incoll.inproc.crossref}
+{ editor empty$
+  editor field.or.null author field.or.null =
+  or
+    { key empty$
+	{ booktitle empty$
+	    { "need editor, key, or booktitle for " cite$ * " to crossref " *
+	      crossref * warning$
+	      ""
+	    }
+	    { "In {\em " booktitle * "\/}" * }
+	  if$
+	}
+	{ "In " key * }
+      if$
+    }
+    { "In " format.crossref.editor * }
+  if$
+  " \cite{" * crossref * "}" *
+}
+
+FUNCTION {article}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  new.block
+  format.title "title" output.check
+  new.block
+  crossref missing$
+    { journal emphasize "journal" output.check
+      format.vol.num.pages output
+      format.date "year" output.check
+    }
+    { format.article.crossref output.nonnull
+      format.pages output
+    }
+  if$
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {book}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  author empty$
+    { format.editors "author and editor" output.check }
+    { format.authors output.nonnull
+      crossref missing$
+	{ "author and editor" editor either.or.check }
+	'skip$
+      if$
+    }
+  if$
+  new.block
+  format.btitle "title" output.check
+  crossref missing$
+    { format.bvolume output
+      new.block
+      format.number.series output
+      new.sentence
+      publisher "publisher" output.check
+      address output
+    }
+    { new.block
+      format.book.crossref output.nonnull
+    }
+  if$
+  format.edition output
+  format.date "year" output.check
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {booklet}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors output
+  new.block
+  format.title "title" output.check
+  howpublished address new.block.checkb
+  howpublished output
+  address output
+  format.date output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {inbook}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  author empty$
+    { format.editors "author and editor" output.check }
+    { format.authors output.nonnull
+      crossref missing$
+	{ "author and editor" editor either.or.check }
+	'skip$
+      if$
+    }
+  if$
+  new.block
+  format.btitle "title" output.check
+  crossref missing$
+    { format.bvolume output
+      format.chapter.pages "chapter and pages" output.check
+      new.block
+      format.number.series output
+      new.sentence
+      publisher "publisher" output.check
+      address output
+    }
+    { format.chapter.pages "chapter and pages" output.check
+      new.block
+      format.book.crossref output.nonnull
+    }
+  if$
+  format.edition output
+  format.date "year" output.check
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {incollection}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  new.block
+  format.title "title" output.check
+  new.block
+  crossref missing$
+    { format.in.ed.booktitle "booktitle" output.check
+      format.bvolume output
+      format.number.series output
+      format.chapter.pages output
+      new.sentence
+      publisher "publisher" output.check
+      address output
+      format.edition output
+      format.date "year" output.check
+    }
+    { format.incoll.inproc.crossref output.nonnull
+      format.chapter.pages output
+    }
+  if$
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {inproceedings}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  new.block
+  format.title "title" output.check
+  new.block
+  crossref missing$
+    { format.in.ed.booktitle "booktitle" output.check
+      format.bvolume output
+      format.number.series output
+      format.pages output
+      address empty$
+	{ organization publisher new.sentence.checkb
+	  organization output
+	  publisher output
+	  format.date "year" output.check
+	}
+	{ address output.nonnull
+	  format.date "year" output.check
+	  new.sentence
+	  organization output
+	  publisher output
+	}
+      if$
+    }
+    { format.incoll.inproc.crossref output.nonnull
+      format.pages output
+    }
+  if$
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {conference} { inproceedings }
+
+FUNCTION {manual}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  author empty$
+    { organization empty$
+	'skip$
+	{ organization output.nonnull
+	  address output
+	}
+      if$
+    }
+    { format.authors output.nonnull }
+  if$
+  new.block
+  format.btitle "title" output.check
+  author empty$
+    { organization empty$
+	{ address new.block.checka
+	  address output
+	}
+	'skip$
+      if$
+    }
+    { organization address new.block.checkb
+      organization output
+      address output
+    }
+  if$
+  format.edition output
+  format.date output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {mastersthesis}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  new.block
+  format.title "title" output.check
+  new.block
+  "Master's thesis" format.thesis.type output.nonnull
+  school "school" output.check
+  address output
+  format.date "year" output.check
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {misc}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors output
+  title howpublished new.block.checkb
+  format.title output
+  howpublished new.block.checka
+  howpublished output
+  format.date output
+  new.block
+  note output
+  fin.entry
+  empty.misc.check
+}
+
+FUNCTION {phdthesis}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  new.block
+  format.btitle "title" output.check
+  new.block
+  "PhD thesis" format.thesis.type output.nonnull
+  school "school" output.check
+  address output
+  format.date "year" output.check
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {proceedings}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  editor empty$
+    { organization output }
+    { format.editors output.nonnull }
+  if$
+  new.block
+  format.btitle "title" output.check
+  format.bvolume output
+  format.number.series output
+  address empty$
+    { editor empty$
+	{ publisher new.sentence.checka }
+	{ organization publisher new.sentence.checkb
+	  organization output
+	}
+      if$
+      publisher output
+      format.date "year" output.check
+    }
+    { address output.nonnull
+      format.date "year" output.check
+      new.sentence
+      editor empty$
+	'skip$
+	{ organization output }
+      if$
+      publisher output
+    }
+  if$
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {techreport}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  new.block
+  format.title "title" output.check
+  new.block
+  format.tr.number output.nonnull
+  institution "institution" output.check
+  address output
+  format.date "year" output.check
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {unpublished}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  new.block
+  format.title "title" output.check
+  new.block
+  note "note" output.check
+  format.date output
+  fin.entry
+}
+
+FUNCTION {default.type} { misc }
+
+MACRO {jan} {"January"}
+
+MACRO {feb} {"February"}
+
+MACRO {mar} {"March"}
+
+MACRO {apr} {"April"}
+
+MACRO {may} {"May"}
+
+MACRO {jun} {"June"}
+
+MACRO {jul} {"July"}
+
+MACRO {aug} {"August"}
+
+MACRO {sep} {"September"}
+
+MACRO {oct} {"October"}
+
+MACRO {nov} {"November"}
+
+MACRO {dec} {"December"}
+
+MACRO {acmcs} {"ACM Computing Surveys"}
+
+MACRO {acta} {"Acta Informatica"}
+
+MACRO {cacm} {"Communications of the ACM"}
+
+MACRO {ibmjrd} {"IBM Journal of Research and Development"}
+
+MACRO {ibmsj} {"IBM Systems Journal"}
+
+MACRO {ieeese} {"IEEE Transactions on Software Engineering"}
+
+MACRO {ieeetc} {"IEEE Transactions on Computers"}
+
+MACRO {ieeetcad}
+ {"IEEE Transactions on Computer-Aided Design of Integrated Circuits"}
+
+MACRO {ipl} {"Information Processing Letters"}
+
+MACRO {jacm} {"Journal of the ACM"}
+
+MACRO {jcss} {"Journal of Computer and System Sciences"}
+
+MACRO {scp} {"Science of Computer Programming"}
+
+MACRO {sicomp} {"SIAM Journal on Computing"}
+
+MACRO {tocs} {"ACM Transactions on Computer Systems"}
+
+MACRO {tods} {"ACM Transactions on Database Systems"}
+
+MACRO {tog} {"ACM Transactions on Graphics"}
+
+MACRO {toms} {"ACM Transactions on Mathematical Software"}
+
+MACRO {toois} {"ACM Transactions on Office Information Systems"}
+
+MACRO {toplas} {"ACM Transactions on Programming Languages and Systems"}
+
+MACRO {tcs} {"Theoretical Computer Science"}
+
+READ
+
+FUNCTION {sortify}
+{ purify$
+  "l" change.case$
+}
+
+INTEGERS { len }
+
+FUNCTION {chop.word}
+{ 's :=
+  'len :=
+  s #1 len substring$ =
+    { s len #1 + global.max$ substring$ }
+    's
+  if$
+}
+
+FUNCTION {sort.format.names}
+{ 's :=
+  #1 'nameptr :=
+  ""
+  s num.names$ 'numnames :=
+  numnames 'namesleft :=
+    { namesleft #0 > }
+    { nameptr #1 >
+	{ "   " * }
+	'skip$
+      if$
+      s nameptr "{vv{ } }{ll{ }}{  ff{ }}{  jj{ }}" format.name$ 't :=
+      nameptr numnames = t "others" = and
+	{ "et al" * }
+	{ t sortify * }
+      if$
+      nameptr #1 + 'nameptr :=
+      namesleft #1 - 'namesleft :=
+    }
+  while$
+}
+
+FUNCTION {sort.format.title}
+{ 't :=
+  "A " #2
+    "An " #3
+      "The " #4 t chop.word
+    chop.word
+  chop.word
+  sortify
+  #1 global.max$ substring$
+}
+
+FUNCTION {author.sort}
+{ author empty$
+    { key empty$
+	{ "to sort, need author or key in " cite$ * warning$
+	  ""
+	}
+	{ key sortify }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+
+FUNCTION {author.editor.sort}
+{ author empty$
+    { editor empty$
+	{ key empty$
+	    { "to sort, need author, editor, or key in " cite$ * warning$
+	      ""
+	    }
+	    { key sortify }
+	  if$
+	}
+	{ editor sort.format.names }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+
+FUNCTION {author.organization.sort}
+{ author empty$
+    { organization empty$
+	{ key empty$
+	    { "to sort, need author, organization, or key in " cite$ * warning$
+	      ""
+	    }
+	    { key sortify }
+	  if$
+	}
+	{ "The " #4 organization chop.word sortify }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+
+FUNCTION {editor.organization.sort}
+{ editor empty$
+    { organization empty$
+	{ key empty$
+	    { "to sort, need editor, organization, or key in " cite$ * warning$
+	      ""
+	    }
+	    { key sortify }
+	  if$
+	}
+	{ "The " #4 organization chop.word sortify }
+      if$
+    }
+    { editor sort.format.names }
+  if$
+}
+
+FUNCTION {presort}
+{ type$ "book" =
+  type$ "inbook" =
+  or
+    'author.editor.sort
+    { type$ "proceedings" =
+	'editor.organization.sort
+	{ type$ "manual" =
+	    'author.organization.sort
+	    'author.sort
+	  if$
+	}
+      if$
+    }
+  if$
+  "    "
+  *
+  year field.or.null sortify
+  *
+  "    "
+  *
+  title field.or.null
+  sort.format.title
+  *
+  #1 entry.max$ substring$
+  'sort.key$ :=
+}
+
+ITERATE {presort}
+
+SORT
+
+STRINGS { longest.label }
+
+INTEGERS { number.label longest.label.width }
+
+FUNCTION {initialize.longest.label}
+{ "" 'longest.label :=
+  "\" 'cur.letter :=
+  #1 'first.letter.place :=
+  #1 'number.label :=
+  #0 'longest.label.width :=
+}
+
+FUNCTION { def.alphabibitem }
+{ "\def\alphabibitem#1{%" write$ newline$
+  "\expandafter\ifx\csname firstalphabibitem\endcsname" write$ newline$
+  "\relax\def\firstalphabibitem{}" write$ newline$
+  "\else\expandafter" write$ newline$
+  "\ifx\csname alphabibitemskip\endcsname" write$ newline$
+  "\relax\bigskip" write$ newline$
+  "\else\alphabibitemskip" write$ newline$
+  "\fi" write$ newline$
+  "\fi" write$ newline$
+  "\penalty-200\expandafter" write$ newline$
+  "\ifx\csname alphabibitemlabel\endcsname" write$ newline$
+  "\relax\expandafter" write$ newline$
+  "\ifx\csname alphabibitemcontent\endcsname\relax" write$ newline$
+  "\item[\LARGE\bfseries\MakeUppercase{#1}]" write$ newline$
+  "\hfill\vskip 1ex\hrule\medskip" write$ newline$
+  "\else\item[\Large\bfseries\MakeUppercase{#1}]" write$ newline$
+  "\alphabibitemcontent{\MakeUppercase{#1}}%" write$ newline$
+  "\fi" write$ newline$
+  "\else\expandafter" write$ newline$
+  "\ifx\csname alphabibitemcontent\endcsname\relax" write$ newline$
+  "\item[\alphabibitemlabel{\MakeUppercase{#1}}]" write$ newline$
+  "\vskip 1ex\hrule\medskip" write$ newline$
+  "\else\item[\alphabibitemlabel{\MakeUppercase{#1}}]" write$ newline$
+  "\alphabibitemcontent{\MakeUppercase{#1}}%" write$ newline$
+  "\fi" write$ newline$
+  "\fi}" write$ newline$
+   newline$
+}
+
+FUNCTION {longest.label.pass}
+{ number.label int.to.str$ 'label :=
+  number.label #1 + 'number.label :=
+  label width$ longest.label.width >
+    { label 'longest.label :=
+      label width$ 'longest.label.width :=
+    }
+    'skip$
+  if$
+}
+
+EXECUTE {initialize.longest.label}
+
+ITERATE {longest.label.pass}
+
+FUNCTION {begin.bib}
+{ preamble$ empty$
+    'skip$
+    { preamble$ write$ newline$ }
+  if$
+  def.alphabibitem
+  "\begin{thebibliography}{"  longest.label  * "}" * write$ newline$
+}
+
+EXECUTE {begin.bib}
+
+EXECUTE {init.state.consts}
+
+ITERATE {call.type$}
+
+FUNCTION {end.bib}
+{ newline$
+  "\end{thebibliography}" write$ newline$
+}
+
+EXECUTE {end.bib}
diff --git a/Master/texmf-dist/bibtex/bst/sort-by-letters/plainnat-letters.bst b/Master/texmf-dist/bibtex/bst/sort-by-letters/plainnat-letters.bst
new file mode 100644
index 00000000000..a1527a9c83b
--- /dev/null
+++ b/Master/texmf-dist/bibtex/bst/sort-by-letters/plainnat-letters.bst
@@ -0,0 +1,1536 @@
+%% File: `plainnat-letters.bst'
+%% A modification of `plain.bst' for use with natbib package
+%%  add: generation of letters-group for authors
+%%
+%% Copyright 1993-2005 Patrick W Daly
+%% Max-Planck-Institut f\"ur Sonnensystemforschung
+%% Max-Planck-Str. 2
+%% D-37191 Katlenburg-Lindau
+%% Germany
+%% E-mail: daly@mps.mpg.de
+%%
+%% This program can be redistributed and/or modified under the terms
+%% of the LaTeX Project Public License Distributed from CTAN
+%% archives in directory macros/latex/base/lppl.txt; either
+%% version 1 of the License, or any later version.
+%%
+%% Thomas van Oudenhove <vanouden@enstimac.fr>
+%%
+%% Modifications: 21-04-2006
+%%
+%% - in the biblio, the first letter of the name of first author creates
+%%   a separation with other first letters (A, B, and so on)
+%% - Warning : entries must have an author, editor or organization
+%% - \alphabibitem is from Mael Hilléreau <mael.hillereau@free.fr> 
+%%   many thanks to him.
+ENTRY
+  { address
+    author
+    booktitle
+    chapter
+    doi
+    eid
+    edition
+    editor
+    howpublished
+    institution
+    isbn
+    issn
+    journal
+    key
+    month
+    note
+    number
+    organization
+    pages
+    publisher
+    school
+    series
+    title
+    type
+    url
+    volume
+    year
+  }
+  {}
+  { label extra.label sort.label short.list }
+
+INTEGERS { output.state before.all mid.sentence after.sentence after.block }
+
+FUNCTION {init.state.consts}
+{ #0 'before.all :=
+  #1 'mid.sentence :=
+  #2 'after.sentence :=
+  #3 'after.block :=
+}
+
+STRINGS { s t cur.letter first.letter }
+INTEGERS { first.letter.place first.letter.ascii }
+
+FUNCTION {output.nonnull}
+{ 's :=
+  output.state mid.sentence =
+    { ", " * write$ }
+    { output.state after.block =
+        { add.period$ write$
+          newline$
+          "\newblock " write$
+        }
+        { output.state before.all =
+            'write$
+            { add.period$ " " * write$ }
+          if$
+        }
+      if$
+      mid.sentence 'output.state :=
+    }
+  if$
+  s
+}
+
+FUNCTION {output}
+{ duplicate$ empty$
+    'pop$
+    'output.nonnull
+  if$
+}
+
+FUNCTION {output.check}
+{ 't :=
+  duplicate$ empty$
+    { pop$ "empty " t * " in " * cite$ * warning$ }
+    'output.nonnull
+  if$
+}
+
+FUNCTION {fin.entry}
+{ add.period$
+  write$
+  newline$
+}
+
+FUNCTION {new.block}
+{ output.state before.all =
+    'skip$
+    { after.block 'output.state := }
+  if$
+}
+
+FUNCTION {new.sentence}
+{ output.state after.block =
+    'skip$
+    { output.state before.all =
+        'skip$
+        { after.sentence 'output.state := }
+      if$
+    }
+  if$
+}
+
+FUNCTION {not}
+{   { #0 }
+    { #1 }
+  if$
+}
+
+FUNCTION {and}
+{   'skip$
+    { pop$ #0 }
+  if$
+}
+
+FUNCTION {or}
+{   { pop$ #1 }
+    'skip$
+  if$
+}
+
+FUNCTION {new.block.checka}
+{ empty$
+    'skip$
+    'new.block
+  if$
+}
+
+FUNCTION {new.block.checkb}
+{ empty$
+  swap$ empty$
+  and
+    'skip$
+    'new.block
+  if$
+}
+
+FUNCTION {new.sentence.checka}
+{ empty$
+    'skip$
+    'new.sentence
+  if$
+}
+
+FUNCTION {new.sentence.checkb}
+{ empty$
+  swap$ empty$
+  and
+    'skip$
+    'new.sentence
+  if$
+}
+
+FUNCTION {field.or.null}
+{ duplicate$ empty$
+    { pop$ "" }
+    'skip$
+  if$
+}
+
+FUNCTION {emphasize}
+{ duplicate$ empty$
+    { pop$ "" }
+    { "\emph{" swap$ * "}" * }
+  if$
+}
+
+FUNCTION { author.find.first.letter }
+{ author #1 "{vv }{ll }{ff }, {jj }" format.name$ "u" change.case$
+  purify$ first.letter.place #1 substring$ 'first.letter := 
+  first.letter chr.to.int$ 'first.letter.ascii :=
+}
+
+FUNCTION { editor.find.first.letter }
+{ editor #1 "{vv }{ll }{ff }, {jj }" format.name$ "u" change.case$ 
+  purify$ first.letter.place #1 substring$ 'first.letter :=
+  first.letter chr.to.int$ 'first.letter.ascii :=
+}
+
+FUNCTION { organization.find.first.letter }
+{ organization #1 "{vv }{ll }{ff }, {jj }" format.name$ "u" change.case$
+  purify$ first.letter.place #1 substring$ 'first.letter := 
+  first.letter chr.to.int$ 'first.letter.ascii :=
+}
+
+FUNCTION { find.firstletter }
+{ author empty$
+    { editor empty$
+%        { organization empty$
+          { "Nor author, editor neither organization for entry " cite$ * warning$ }
+%          { organization.find.first.letter
+%            { first.letter.ascii #64 > first.letter.ascii #91 < and
+%              first.letter.ascii #96 > first.letter.ascii #123 < and or not }
+%            { first.letter.place #1 + 'first.letter.place :=
+%              organization.find.first.letter }
+%          while$ }
+%          if$ }
+        { editor.find.first.letter
+          { first.letter.ascii #64 > first.letter.ascii #91 < and
+            first.letter.ascii #96 > first.letter.ascii #123 < and or not }
+          { first.letter.place #1 + 'first.letter.place :=
+            editor.find.first.letter }
+        while$
+        }
+      if$
+    }
+    { author.find.first.letter
+      { first.letter.ascii #64 > first.letter.ascii #91 < and
+        first.letter.ascii #96 > first.letter.ascii #123 < and or not }
+      { first.letter.place #1 + 'first.letter.place :=
+        author.find.first.letter }
+    while$
+    }
+  if$
+  #1 'first.letter.place :=
+}
+
+INTEGERS { nameptr namesleft numnames }
+
+FUNCTION {format.names}
+{ 's :=
+  #1 'nameptr :=
+  s num.names$ 'numnames :=
+  numnames 'namesleft :=
+    { namesleft #0 > }
+    { s nameptr "{ff~}{vv~}{ll}{, jj}" format.name$ 't :=
+      nameptr #1 >
+        { namesleft #1 >
+            { ", " * t * }
+            { numnames #2 >
+                { "," * }
+                'skip$
+              if$
+              t "others" =
+                { " et~al." * }
+                { " and " * t * }
+              if$
+            }
+          if$
+        }
+        't
+      if$
+      nameptr #1 + 'nameptr :=
+      namesleft #1 - 'namesleft :=
+    }
+  while$
+}
+
+FUNCTION {format.key}
+{ empty$
+    { key field.or.null }
+    { "" }
+  if$
+}
+
+FUNCTION {format.authors}
+{ author empty$
+    { "" }
+    { author format.names }
+  if$
+}
+
+FUNCTION {format.editors}
+{ editor empty$
+    { "" }
+    { editor format.names
+      editor num.names$ #1 >
+        { ", editors" * }
+        { ", editor" * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.isbn}
+{ isbn empty$
+    { "" }
+    { new.block "ISBN " isbn * }
+  if$
+}
+
+FUNCTION {format.issn}
+{ issn empty$
+    { "" }
+    { new.block "ISSN " issn * }
+  if$
+}
+
+FUNCTION {format.url}
+{ url empty$
+    { "" }
+    { new.block "URL \url{" url * "}" * }
+  if$
+}
+
+FUNCTION {format.doi}
+{ doi empty$
+    { "" }
+    { new.block "\doi{" doi * "}" * }
+  if$
+}
+
+FUNCTION {format.title}
+{ title empty$
+    { "" }
+    { title "t" change.case$ }
+  if$
+}
+
+FUNCTION {format.full.names}
+{'s :=
+  #1 'nameptr :=
+  s num.names$ 'numnames :=
+  numnames 'namesleft :=
+    { namesleft #0 > }
+    { s nameptr
+      "{vv~}{ll}" format.name$ 't :=
+      nameptr #1 >
+        {
+          namesleft #1 >
+            { ", " * t * }
+            {
+              numnames #2 >
+                { "," * }
+                'skip$
+              if$
+              t "others" =
+                { " et~al." * }
+                { " and " * t * }
+              if$
+            }
+          if$
+        }
+        't
+      if$
+      nameptr #1 + 'nameptr :=
+      namesleft #1 - 'namesleft :=
+    }
+  while$
+}
+
+FUNCTION {author.editor.full}
+{ author empty$
+    { editor empty$
+        { "" }
+        { editor format.full.names }
+      if$
+    }
+    { author format.full.names }
+  if$
+}
+
+FUNCTION {author.full}
+{ author empty$
+    { "" }
+    { author format.full.names }
+  if$
+}
+
+FUNCTION {editor.full}
+{ editor empty$
+    { "" }
+    { editor format.full.names }
+  if$
+}
+
+FUNCTION {make.full.names}
+{ type$ "book" =
+  type$ "inbook" =
+  or
+    'author.editor.full
+    { type$ "proceedings" =
+        'editor.full
+        'author.full
+      if$
+    }
+  if$
+}
+
+FUNCTION {output.bibitem}
+{ newline$
+  "\bibitem[" write$
+  label write$
+  ")" make.full.names duplicate$ short.list =
+     { pop$ }
+     { * }
+   if$
+  "]{" * write$
+  cite$ write$
+  "}" write$
+  newline$
+  ""
+  before.all 'output.state :=
+}
+
+FUNCTION {output.letter}
+{ first.letter cur.letter =
+    { skip$ }
+    { newline$
+      "\alphabibitem{" first.letter * "}" * write$
+      newline$ 
+      first.letter 'cur.letter := }
+  if$
+  cur.letter "\" = 
+    { first.letter 'cur.letter := }
+    { skip$ }
+  if$
+}
+
+
+FUNCTION {n.dashify}
+{ 't :=
+  ""
+    { t empty$ not }
+    { t #1 #1 substring$ "-" =
+        { t #1 #2 substring$ "--" = not
+            { "--" *
+              t #2 global.max$ substring$ 't :=
+            }
+            {   { t #1 #1 substring$ "-" = }
+                { "-" *
+                  t #2 global.max$ substring$ 't :=
+                }
+              while$
+            }
+          if$
+        }
+        { t #1 #1 substring$ *
+          t #2 global.max$ substring$ 't :=
+        }
+      if$
+    }
+  while$
+}
+
+FUNCTION {format.date}
+{ year duplicate$ empty$
+    { "empty year in " cite$ * warning$
+       pop$ "" }
+    'skip$
+  if$
+  month empty$
+    'skip$
+    { month
+      " " * swap$ *
+    }
+  if$
+  extra.label *
+}
+
+FUNCTION {format.btitle}
+{ title emphasize
+}
+
+FUNCTION {tie.or.space.connect}
+{ duplicate$ text.length$ #3 <
+    { "~" }
+    { " " }
+  if$
+  swap$ * *
+}
+
+FUNCTION {either.or.check}
+{ empty$
+    'pop$
+    { "can't use both " swap$ * " fields in " * cite$ * warning$ }
+  if$
+}
+
+FUNCTION {format.bvolume}
+{ volume empty$
+    { "" }
+    { "volume" volume tie.or.space.connect
+      series empty$
+        'skip$
+        { " of " * series emphasize * }
+      if$
+      "volume and number" number either.or.check
+    }
+  if$
+}
+
+FUNCTION {format.number.series}
+{ volume empty$
+    { number empty$
+        { series field.or.null }
+        { output.state mid.sentence =
+            { "number" }
+            { "Number" }
+          if$
+          number tie.or.space.connect
+          series empty$
+            { "there's a number but no series in " cite$ * warning$ }
+            { " in " * series * }
+          if$
+        }
+      if$
+    }
+    { "" }
+  if$
+}
+
+FUNCTION {format.edition}
+{ edition empty$
+    { "" }
+    { output.state mid.sentence =
+        { edition "l" change.case$ " edition" * }
+        { edition "t" change.case$ " edition" * }
+      if$
+    }
+  if$
+}
+
+INTEGERS { multiresult }
+
+FUNCTION {multi.page.check}
+{ 't :=
+  #0 'multiresult :=
+    { multiresult not
+      t empty$ not
+      and
+    }
+    { t #1 #1 substring$
+      duplicate$ "-" =
+      swap$ duplicate$ "," =
+      swap$ "+" =
+      or or
+        { #1 'multiresult := }
+        { t #2 global.max$ substring$ 't := }
+      if$
+    }
+  while$
+  multiresult
+}
+
+FUNCTION {format.pages}
+{ pages empty$
+    { "" }
+    { pages multi.page.check
+        { "pages" pages n.dashify tie.or.space.connect }
+        { "page" pages tie.or.space.connect }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.eid}
+{ eid empty$
+    { "" }
+    { "art." eid tie.or.space.connect }
+  if$
+}
+
+FUNCTION {format.vol.num.pages}
+{ volume field.or.null
+  number empty$
+    'skip$
+    { "\penalty0 (" number * ")" * *
+      volume empty$
+        { "there's a number but no volume in " cite$ * warning$ }
+        'skip$
+      if$
+    }
+  if$
+  pages empty$
+    'skip$
+    { duplicate$ empty$
+        { pop$ format.pages }
+        { ":\penalty0 " * pages n.dashify * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.vol.num.eid}
+{ volume field.or.null
+  number empty$
+    'skip$
+    { "\penalty0 (" number * ")" * *
+      volume empty$
+        { "there's a number but no volume in " cite$ * warning$ }
+        'skip$
+      if$
+    }
+  if$
+  eid empty$
+    'skip$
+    { duplicate$ empty$
+        { pop$ format.eid }
+        { ":\penalty0 " * eid * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.chapter.pages}
+{ chapter empty$
+    'format.pages
+    { type empty$
+        { "chapter" }
+        { type "l" change.case$ }
+      if$
+      chapter tie.or.space.connect
+      pages empty$
+        'skip$
+        { ", " * format.pages * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.in.ed.booktitle}
+{ booktitle empty$
+    { "" }
+    { editor empty$
+        { "In " booktitle emphasize * }
+        { "In " format.editors * ", " * booktitle emphasize * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {empty.misc.check}
+{ author empty$ title empty$ howpublished empty$
+  month empty$ year empty$ note empty$
+  and and and and and
+  key empty$ not and
+    { "all relevant fields are empty in " cite$ * warning$ }
+    'skip$
+  if$
+}
+
+FUNCTION {format.thesis.type}
+{ type empty$
+    'skip$
+    { pop$
+      type "t" change.case$
+    }
+  if$
+}
+
+FUNCTION {format.tr.number}
+{ type empty$
+    { "Technical Report" }
+    'type
+  if$
+  number empty$
+    { "t" change.case$ }
+    { number tie.or.space.connect }
+  if$
+}
+
+FUNCTION {format.article.crossref}
+{ key empty$
+    { journal empty$
+        { "need key or journal for " cite$ * " to crossref " * crossref *
+          warning$
+          ""
+        }
+        { "In \emph{" journal * "}" * }
+      if$
+    }
+    { "In " key * }
+  if$
+  " \citep{" * crossref * "}" *
+}
+
+FUNCTION {format.book.crossref}
+{ volume empty$
+    { "empty volume in " cite$ * "'s crossref of " * crossref * warning$
+      "In "
+    }
+    { "Volume" volume tie.or.space.connect
+      " of " *
+    }
+  if$
+  editor empty$
+  editor field.or.null author field.or.null =
+  or
+    { key empty$
+        { series empty$
+            { "need editor, key, or series for " cite$ * " to crossref " *
+              crossref * warning$
+              "" *
+            }
+            { "\emph{" * series * "}" * }
+          if$
+        }
+        { key * }
+      if$
+    }
+    'skip$
+  if$
+  ", \citet{" * crossref * "}" *
+}
+
+FUNCTION {format.incoll.inproc.crossref}
+{ editor empty$
+  editor field.or.null author field.or.null =
+  or
+    { key empty$
+        { booktitle empty$
+            { "need editor, key, or booktitle for " cite$ * " to crossref " *
+              crossref * warning$
+              ""
+            }
+            { "In \emph{" booktitle * "}" * }
+          if$
+        }
+        { "In " key * }
+      if$
+    }
+    { "In " }
+  if$
+  " \citet{" * crossref * "}" *
+}
+
+FUNCTION {article}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  author format.key output
+  new.block
+  format.title "title" output.check
+  new.block
+  crossref missing$
+    { journal emphasize "journal" output.check
+      eid empty$
+        { format.vol.num.pages output }
+        { format.vol.num.eid output }
+      if$
+      format.date "year" output.check
+    }
+    { format.article.crossref output.nonnull
+      eid empty$
+        { format.pages output }
+        { format.eid output }
+      if$
+    }
+  if$
+  format.issn output
+  format.doi output
+  format.url output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {book}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  author empty$
+    { format.editors "author and editor" output.check
+      editor format.key output
+    }
+    { format.authors output.nonnull
+      crossref missing$
+        { "author and editor" editor either.or.check }
+        'skip$
+      if$
+    }
+  if$
+  new.block
+  format.btitle "title" output.check
+  crossref missing$
+    { format.bvolume output
+      new.block
+      format.number.series output
+      new.sentence
+      publisher "publisher" output.check
+      address output
+    }
+    { new.block
+      format.book.crossref output.nonnull
+    }
+  if$
+  format.edition output
+  format.date "year" output.check
+  format.isbn output
+  format.doi output
+  format.url output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {booklet}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors output
+  author format.key output
+  new.block
+  format.title "title" output.check
+  howpublished address new.block.checkb
+  howpublished output
+  address output
+  format.date output
+  format.isbn output
+  format.doi output
+  format.url output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {inbook}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  author empty$
+    { format.editors "author and editor" output.check
+      editor format.key output
+    }
+    { format.authors output.nonnull
+      crossref missing$
+        { "author and editor" editor either.or.check }
+        'skip$
+      if$
+    }
+  if$
+  new.block
+  format.btitle "title" output.check
+  crossref missing$
+    { format.bvolume output
+      format.chapter.pages "chapter and pages" output.check
+      new.block
+      format.number.series output
+      new.sentence
+      publisher "publisher" output.check
+      address output
+    }
+    { format.chapter.pages "chapter and pages" output.check
+      new.block
+      format.book.crossref output.nonnull
+    }
+  if$
+  format.edition output
+  format.date "year" output.check
+  format.isbn output
+  format.doi output
+  format.url output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {incollection}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  author format.key output
+  new.block
+  format.title "title" output.check
+  new.block
+  crossref missing$
+    { format.in.ed.booktitle "booktitle" output.check
+      format.bvolume output
+      format.number.series output
+      format.chapter.pages output
+      new.sentence
+      publisher "publisher" output.check
+      address output
+      format.edition output
+      format.date "year" output.check
+    }
+    { format.incoll.inproc.crossref output.nonnull
+      format.chapter.pages output
+    }
+  if$
+  format.isbn output
+  format.doi output
+  format.url output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {inproceedings}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  author format.key output
+  new.block
+  format.title "title" output.check
+  new.block
+  crossref missing$
+    { format.in.ed.booktitle "booktitle" output.check
+      format.bvolume output
+      format.number.series output
+      format.pages output
+      address empty$
+        { organization publisher new.sentence.checkb
+          organization output
+          publisher output
+          format.date "year" output.check
+        }
+        { address output.nonnull
+          format.date "year" output.check
+          new.sentence
+          organization output
+          publisher output
+        }
+      if$
+    }
+    { format.incoll.inproc.crossref output.nonnull
+      format.pages output
+    }
+  if$
+  format.isbn output
+  format.doi output
+  format.url output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {conference} { inproceedings }
+
+FUNCTION {manual}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors output
+  author format.key output
+  new.block
+  format.btitle "title" output.check
+  organization address new.block.checkb
+  organization output
+  address output
+  format.edition output
+  format.date output
+  format.url output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {mastersthesis}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  author format.key output
+  new.block
+  format.title "title" output.check
+  new.block
+  "Master's thesis" format.thesis.type output.nonnull
+  school "school" output.check
+  address output
+  format.date "year" output.check
+  format.url output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {misc}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors output
+  author format.key output
+  title howpublished new.block.checkb
+  format.title output
+  howpublished new.block.checka
+  howpublished output
+  format.date output
+  format.issn output
+  format.url output
+  new.block
+  note output
+  fin.entry
+  empty.misc.check
+}
+
+FUNCTION {phdthesis}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  author format.key output
+  new.block
+  format.btitle "title" output.check
+  new.block
+  "PhD thesis" format.thesis.type output.nonnull
+  school "school" output.check
+  address output
+  format.date "year" output.check
+  format.url output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {proceedings}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.editors output
+  editor format.key output
+  new.block
+  format.btitle "title" output.check
+  format.bvolume output
+  format.number.series output
+  address output
+  format.date "year" output.check
+  new.sentence
+  organization output
+  publisher output
+  format.isbn output
+  format.doi output
+  format.url output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {techreport}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  author format.key output
+  new.block
+  format.title "title" output.check
+  new.block
+  format.tr.number output.nonnull
+  institution "institution" output.check
+  address output
+  format.date "year" output.check
+  format.url output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {unpublished}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  author format.key output
+  new.block
+  format.title "title" output.check
+  format.url output
+  new.block
+  note "note" output.check
+  format.date output
+  fin.entry
+}
+
+FUNCTION {default.type} { misc }
+
+
+MACRO {jan} {"January"}
+
+MACRO {feb} {"February"}
+
+MACRO {mar} {"March"}
+
+MACRO {apr} {"April"}
+
+MACRO {may} {"May"}
+
+MACRO {jun} {"June"}
+
+MACRO {jul} {"July"}
+
+MACRO {aug} {"August"}
+
+MACRO {sep} {"September"}
+
+MACRO {oct} {"October"}
+
+MACRO {nov} {"November"}
+
+MACRO {dec} {"December"}
+
+
+
+MACRO {acmcs} {"ACM Computing Surveys"}
+
+MACRO {acta} {"Acta Informatica"}
+
+MACRO {cacm} {"Communications of the ACM"}
+
+MACRO {ibmjrd} {"IBM Journal of Research and Development"}
+
+MACRO {ibmsj} {"IBM Systems Journal"}
+
+MACRO {ieeese} {"IEEE Transactions on Software Engineering"}
+
+MACRO {ieeetc} {"IEEE Transactions on Computers"}
+
+MACRO {ieeetcad}
+ {"IEEE Transactions on Computer-Aided Design of Integrated Circuits"}
+
+MACRO {ipl} {"Information Processing Letters"}
+
+MACRO {jacm} {"Journal of the ACM"}
+
+MACRO {jcss} {"Journal of Computer and System Sciences"}
+
+MACRO {scp} {"Science of Computer Programming"}
+
+MACRO {sicomp} {"SIAM Journal on Computing"}
+
+MACRO {tocs} {"ACM Transactions on Computer Systems"}
+
+MACRO {tods} {"ACM Transactions on Database Systems"}
+
+MACRO {tog} {"ACM Transactions on Graphics"}
+
+MACRO {toms} {"ACM Transactions on Mathematical Software"}
+
+MACRO {toois} {"ACM Transactions on Office Information Systems"}
+
+MACRO {toplas} {"ACM Transactions on Programming Languages and Systems"}
+
+MACRO {tcs} {"Theoretical Computer Science"}
+
+
+READ
+
+FUNCTION {sortify}
+{ purify$
+  "l" change.case$
+}
+
+INTEGERS { len }
+
+FUNCTION {chop.word}
+{ 's :=
+  'len :=
+  s #1 len substring$ =
+    { s len #1 + global.max$ substring$ }
+    's
+  if$
+}
+
+FUNCTION {format.lab.names}
+{ 's :=
+  s #1 "{vv~}{ll}" format.name$
+  s num.names$ duplicate$
+  #2 >
+    { pop$ " et~al." * }
+    { #2 <
+        'skip$
+        { s #2 "{ff }{vv }{ll}{ jj}" format.name$ "others" =
+            { " et~al." * }
+            { " and " * s #2 "{vv~}{ll}" format.name$ * }
+          if$
+        }
+      if$
+    }
+  if$
+}
+
+FUNCTION {author.key.label}
+{ author empty$
+    { key empty$
+        { cite$ #1 #3 substring$ }
+        'key
+      if$
+    }
+    { author format.lab.names }
+  if$
+}
+
+FUNCTION {author.editor.key.label}
+{ author empty$
+    { editor empty$
+        { key empty$
+            { cite$ #1 #3 substring$ }
+            'key
+          if$
+        }
+        { editor format.lab.names }
+      if$
+    }
+    { author format.lab.names }
+  if$
+}
+
+FUNCTION {author.key.organization.label}
+{ author empty$
+    { key empty$
+        { organization empty$
+            { cite$ #1 #3 substring$ }
+            { "The " #4 organization chop.word #3 text.prefix$ }
+          if$
+        }
+        'key
+      if$
+    }
+    { author format.lab.names }
+  if$
+}
+
+FUNCTION {editor.key.organization.label}
+{ editor empty$
+    { key empty$
+        { organization empty$
+            { cite$ #1 #3 substring$ }
+            { "The " #4 organization chop.word #3 text.prefix$ }
+          if$
+        }
+        'key
+      if$
+    }
+    { editor format.lab.names }
+  if$
+}
+
+FUNCTION {calc.short.authors}
+{ type$ "book" =
+  type$ "inbook" =
+  or
+    'author.editor.key.label
+    { type$ "proceedings" =
+        'editor.key.organization.label
+        { type$ "manual" =
+            'author.key.organization.label
+            'author.key.label
+          if$
+        }
+      if$
+    }
+  if$
+  'short.list :=
+}
+
+FUNCTION {calc.label}
+{ calc.short.authors
+  short.list
+  "("
+  *
+  year duplicate$ empty$
+  short.list key field.or.null = or
+     { pop$ "" }
+     'skip$
+  if$
+  *
+  'label :=
+}
+
+FUNCTION {sort.format.names}
+{ 's :=
+  #1 'nameptr :=
+  ""
+  s num.names$ 'numnames :=
+  numnames 'namesleft :=
+    { namesleft #0 > }
+    {
+      s nameptr "{vv{ } }{ll{ }}{  ff{ }}{  jj{ }}" format.name$ 't :=
+      nameptr #1 >
+        {
+          "   "  *
+          namesleft #1 = t "others" = and
+            { "zzzzz" * }
+            { numnames #2 > nameptr #2 = and
+                { "zz" * year field.or.null * "   " * }
+                'skip$
+              if$
+              t sortify *
+            }
+          if$
+        }
+        { t sortify * }
+      if$
+      nameptr #1 + 'nameptr :=
+      namesleft #1 - 'namesleft :=
+    }
+  while$
+}
+
+FUNCTION {sort.format.title}
+{ 't :=
+  "A " #2
+    "An " #3
+      "The " #4 t chop.word
+    chop.word
+  chop.word
+  sortify
+  #1 global.max$ substring$
+}
+
+FUNCTION {author.sort}
+{ author empty$
+    { key empty$
+        { "to sort, need author or key in " cite$ * warning$
+          ""
+        }
+        { key sortify }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+
+FUNCTION {author.editor.sort}
+{ author empty$
+    { editor empty$
+        { key empty$
+            { "to sort, need author, editor, or key in " cite$ * warning$
+              ""
+            }
+            { key sortify }
+          if$
+        }
+        { editor sort.format.names }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+
+FUNCTION {author.organization.sort}
+{ author empty$
+    { organization empty$
+        { key empty$
+            { "to sort, need author, organization, or key in " cite$ * warning$
+              ""
+            }
+            { key sortify }
+          if$
+        }
+        { "The " #4 organization chop.word sortify }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+
+FUNCTION {editor.organization.sort}
+{ editor empty$
+    { organization empty$
+        { key empty$
+            { "to sort, need editor, organization, or key in " cite$ * warning$
+              ""
+            }
+            { key sortify }
+          if$
+        }
+        { "The " #4 organization chop.word sortify }
+      if$
+    }
+    { editor sort.format.names }
+  if$
+}
+
+
+FUNCTION {presort}
+{ calc.label
+  label sortify
+  "    "
+  *
+  type$ "book" =
+  type$ "inbook" =
+  or
+    'author.editor.sort
+    { type$ "proceedings" =
+        'editor.organization.sort
+        { type$ "manual" =
+            'author.organization.sort
+            'author.sort
+          if$
+        }
+      if$
+    }
+  if$
+  "    "
+  *
+  cite$
+  *
+  #1 entry.max$ substring$
+  'sort.label :=
+  sort.label *
+  #1 entry.max$ substring$
+  'sort.key$ :=
+}
+
+ITERATE {presort}
+
+SORT
+
+STRINGS { longest.label last.label next.extra }
+
+INTEGERS { longest.label.width last.extra.num number.label }
+
+FUNCTION {initialize.longest.label}
+{ "" 'longest.label :=
+  "\" 'cur.letter :=
+  #1 'first.letter.place :=
+  #0 int.to.chr$ 'last.label :=
+  "" 'next.extra :=
+  #0 'longest.label.width :=
+  #0 'last.extra.num :=
+  #0 'number.label :=
+}
+
+FUNCTION {forward.pass}
+{ last.label label =
+    { last.extra.num #1 + 'last.extra.num :=
+      last.extra.num int.to.chr$ 'extra.label :=
+    }
+    { "a" chr.to.int$ 'last.extra.num :=
+      "" 'extra.label :=
+      label 'last.label :=
+    }
+  if$
+  number.label #1 + 'number.label :=
+}
+
+FUNCTION {reverse.pass}
+{ next.extra "b" =
+    { "a" 'extra.label := }
+    'skip$
+  if$
+  extra.label 'next.extra :=
+  extra.label
+  duplicate$ empty$
+    'skip$
+    { "{\natexlab{" swap$ * "}}" * }
+  if$
+  'extra.label :=
+  label extra.label * 'label :=
+}
+
+FUNCTION { def.alphabibitem }
+{ "\def\alphabibitem#1{%" write$ newline$
+  "\expandafter\ifx\csname firstalphabibitem\endcsname" write$ newline$
+  "\relax\def\firstalphabibitem{}" write$ newline$
+  "\else\expandafter" write$ newline$
+  "\ifx\csname alphabibitemskip\endcsname" write$ newline$
+  "\relax\bigskip" write$ newline$
+  "\else\alphabibitemskip" write$ newline$
+  "\fi" write$ newline$
+  "\fi" write$ newline$
+  "\penalty-200\expandafter" write$ newline$
+  "\ifx\csname alphabibitemlabel\endcsname" write$ newline$
+  "\relax\expandafter" write$ newline$
+  "\ifx\csname alphabibitemcontent\endcsname\relax" write$ newline$
+  "\item[\LARGE\bfseries\MakeUppercase{#1}]" write$ newline$
+  "\hfill\vskip 1ex\hrule\medskip" write$ newline$
+  "\else\item[\Large\bfseries\MakeUppercase{#1}]" write$ newline$
+  "\alphabibitemcontent{\MakeUppercase{#1}}%" write$ newline$
+  "\fi" write$ newline$
+  "\else\expandafter" write$ newline$
+  "\ifx\csname alphabibitemcontent\endcsname\relax" write$ newline$
+  "\item[\alphabibitemlabel{\MakeUppercase{#1}}]" write$ newline$
+  "\vskip 1ex\hrule\medskip" write$ newline$
+  "\else\item[\alphabibitemlabel{\MakeUppercase{#1}}]" write$ newline$
+  "\alphabibitemcontent{\MakeUppercase{#1}}%" write$ newline$
+  "\fi" write$ newline$
+  "\fi}" write$ newline$
+   newline$
+}
+
+EXECUTE {initialize.longest.label}
+
+ITERATE {forward.pass}
+
+REVERSE {reverse.pass}
+
+FUNCTION {bib.sort.order}
+{ sort.label  'sort.key$ :=
+}
+
+ITERATE {bib.sort.order}
+
+SORT
+
+FUNCTION {begin.bib}
+{   preamble$ empty$
+    'skip$
+    { preamble$ write$ newline$ }
+  if$
+  def.alphabibitem
+  "\begin{thebibliography}{" number.label int.to.str$ * "}" *
+  write$ newline$
+  "\providecommand{\natexlab}[1]{#1}"
+  write$ newline$
+  "\providecommand{\url}[1]{\texttt{#1}}"
+  write$ newline$
+  "\expandafter\ifx\csname urlstyle\endcsname\relax"
+  write$ newline$
+  "  \providecommand{\doi}[1]{doi: #1}\else"
+  write$ newline$
+  "  \providecommand{\doi}{doi: \begingroup \urlstyle{rm}\Url}\fi"
+  write$ newline$
+}
+
+EXECUTE {begin.bib}
+
+EXECUTE {init.state.consts}
+
+ITERATE {call.type$}
+
+FUNCTION {end.bib}
+{ newline$
+  "\end{thebibliography}" write$ newline$
+}
+
+EXECUTE {end.bib}
diff --git a/Master/texmf-dist/bibtex/bst/sort-by-letters/siam-letters.bst b/Master/texmf-dist/bibtex/bst/sort-by-letters/siam-letters.bst
new file mode 100644
index 00000000000..c1ddcdf4c25
--- /dev/null
+++ b/Master/texmf-dist/bibtex/bst/sort-by-letters/siam-letters.bst
@@ -0,0 +1,1154 @@
+% BibTeX bibliography style `siam-letters'
+%% adapted from SIAM bibliography style (29-Jan-88 version)
+%% (C) 2006 - Thomas van Oudenhove 
+%% when sorting by letter, write the first letter of author 
+%% or editor - bug with organization...
+
+ENTRY
+  { address
+    author
+    booktitle
+    chapter
+    edition
+    editor
+    howpublished
+    institution
+    journal
+    key
+    month
+    note
+    number
+    organization
+    pages
+    publisher
+    school
+    series
+    title
+    type
+    volume
+    year
+  }
+  {}
+  { label }
+
+INTEGERS { output.state before.all mid.sentence after.block }
+
+FUNCTION {init.state.consts}
+{ #0 'before.all :=
+  #1 'mid.sentence :=
+  #2 'after.block :=
+}
+
+STRINGS { s t cur.letter first.letter }
+INTEGERS { first.letter.place first.letter.ascii }
+
+FUNCTION {output.nonnull}
+{ 's :=
+  output.state mid.sentence =
+    { ", " * write$ }
+    { output.state after.block =
+	{ add.period$ write$
+	  newline$
+	  "\newblock " write$
+	}
+	'write$
+      if$
+      mid.sentence 'output.state :=
+    }
+  if$
+  s
+}
+
+FUNCTION {output}
+{ duplicate$ empty$
+    'pop$
+    'output.nonnull
+  if$
+}
+
+FUNCTION {output.check}
+{ 't :=
+  duplicate$ empty$
+    { pop$ "empty " t * " in " * cite$ * warning$ }
+    'output.nonnull
+  if$
+}
+
+FUNCTION {output.letter}
+{ first.letter cur.letter =
+    { skip$ }
+    { newline$
+      "\alphabibitem{" first.letter * "}" * write$
+      newline$ 
+      first.letter 'cur.letter := }
+  if$
+  cur.letter "\" = 
+    { first.letter 'cur.letter := }
+    { skip$ }
+  if$
+}
+
+FUNCTION {output.bibitem}
+{ newline$
+  "\bibitem{" write$
+  cite$ write$
+  "}" write$
+  newline$
+  ""
+  before.all 'output.state :=
+}
+
+FUNCTION {fin.entry}
+{ add.period$
+  write$
+  newline$
+}
+
+FUNCTION {new.block}
+{ output.state before.all =
+    'skip$
+    { after.block 'output.state := }
+  if$
+}
+
+FUNCTION {not}
+{   { #0 }
+    { #1 }
+  if$
+}
+
+FUNCTION {and}
+{   'skip$
+    { pop$ #0 }
+  if$
+}
+
+FUNCTION {or}
+{   { pop$ #1 }
+    'skip$
+  if$
+}
+
+FUNCTION {new.block.checka}
+{ empty$
+    'skip$
+    'new.block
+  if$
+}
+
+FUNCTION {field.or.null}
+{ duplicate$ empty$
+    { pop$ "" }
+    'skip$
+  if$
+}
+
+FUNCTION {emphasize}
+{ duplicate$ empty$
+    { pop$ "" }
+    { "{\em " swap$ * "}" * }
+  if$
+}
+
+FUNCTION {scapify}
+{ duplicate$ empty$
+    { pop$ "" }
+    { "{\sc " swap$ * "}" * }
+  if$
+}
+
+FUNCTION { author.find.first.letter }
+{ author #1 "{vv }{ll }{ff }, {jj }" format.name$ "u" change.case$
+  purify$ first.letter.place #1 substring$ 'first.letter := 
+  first.letter chr.to.int$ 'first.letter.ascii :=
+}
+
+FUNCTION { editor.find.first.letter }
+{ editor #1 "{vv }{ll }{ff }, {jj }" format.name$ "u" change.case$ 
+  purify$ first.letter.place #1 substring$ 'first.letter :=
+  first.letter chr.to.int$ 'first.letter.ascii :=
+}
+
+FUNCTION { organization.find.first.letter }
+{ organization #1 "{vv }{ll }{ff }, {jj }" format.name$ "u" change.case$
+  purify$ first.letter.place #1 substring$ 'first.letter := 
+  first.letter chr.to.int$ 'first.letter.ascii :=
+}
+
+FUNCTION { find.firstletter }
+{ author empty$
+    { editor empty$
+%        { organization empty$
+          { "Nor author, editor neither organization for entry " cite$ * warning$ }
+%          { organization.find.first.letter
+%            { first.letter.ascii #64 > first.letter.ascii #91 < and
+%              first.letter.ascii #96 > first.letter.ascii #123 < and or not }
+%            { first.letter.place #1 + 'first.letter.place :=
+%              organization.find.first.letter }
+%          while$ }
+%          if$ }
+        { editor.find.first.letter
+          { first.letter.ascii #64 > first.letter.ascii #91 < and
+            first.letter.ascii #96 > first.letter.ascii #123 < and or not }
+          { first.letter.place #1 + 'first.letter.place :=
+            editor.find.first.letter }
+        while$
+        }
+      if$
+    }
+    { author.find.first.letter
+      { first.letter.ascii #64 > first.letter.ascii #91 < and
+        first.letter.ascii #96 > first.letter.ascii #123 < and or not }
+      { first.letter.place #1 + 'first.letter.place :=
+        author.find.first.letter }
+    while$
+    }
+  if$
+  #1 'first.letter.place :=
+}
+
+INTEGERS { nameptr namesleft numnames }
+
+FUNCTION {format.names}
+{ 's :=
+  #1 'nameptr :=
+  s num.names$ 'numnames :=
+  numnames 'namesleft :=
+    { namesleft #0 > }
+    { s nameptr "{f.~}{vv~}{ll}{, jj}" format.name$ 't :=
+      nameptr #1 >
+	{ namesleft #1 >
+	    { ", " * t * }
+	    { numnames #2 >
+		{ "," * }
+		'skip$
+	      if$
+	      t "others" =
+		{ " et~al." * }
+		{ " and " * t * }
+	      if$
+	    }
+	  if$
+	}
+	't
+      if$
+      nameptr #1 + 'nameptr :=
+      namesleft #1 - 'namesleft :=
+    }
+  while$
+}
+
+STRINGS { last.authors }
+
+FUNCTION {init.last.authors}
+{ "" 'last.authors :=
+}
+
+FUNCTION {format.authors}
+{ author empty$
+    { "" 'last.authors :=
+      ""
+    }
+    { author last.authors =
+        { "\leavevmode\vrule height 2pt depth -1.6pt width 23pt" }
+        { author format.names scapify }
+      if$
+      author 'last.authors :=
+    }
+  if$
+}
+
+FUNCTION {format.organization}
+{ organization empty$
+    { "" 'last.authors :=
+      ""
+    }
+    { organization last.authors =
+        { "\leavevmode\vrule height 2pt depth -1.6pt width 23pt" }
+        { organization scapify }
+      if$
+      organization 'last.authors :=
+    }
+  if$
+}
+
+FUNCTION {format.editors}
+{ editor empty$
+    { "" 'last.authors :=
+      ""
+    }
+    { editor last.authors =
+        { "\leavevmode\vrule height 2pt depth -1.6pt width 23pt" }
+	{ editor format.names scapify }
+      if$
+      editor num.names$ #1 >
+        { ", eds." * }
+	{ ", ed." * }
+      if$
+      editor 'last.authors :=
+    }
+  if$
+}
+
+FUNCTION {format.ineditors}
+{ editor empty$
+    { "" }
+    { editor format.names
+      editor num.names$ #1 >
+	{ ", eds." * }
+	{ ", ed." * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.title}
+{ title empty$
+    { "" }
+    { title "t" change.case$ emphasize }
+  if$
+}
+
+FUNCTION {n.dashify}
+{ 't :=
+  ""
+    { t empty$ not }
+    { t #1 #1 substring$ "-" =
+	{ t #1 #2 substring$ "--" = not
+	    { "--" *
+	      t #2 global.max$ substring$ 't :=
+	    }
+	    {   { t #1 #1 substring$ "-" = }
+		{ "-" *
+		  t #2 global.max$ substring$ 't :=
+		}
+	      while$
+	    }
+	  if$
+	}
+	{ t #1 #1 substring$ *
+	  t #2 global.max$ substring$ 't :=
+	}
+      if$
+    }
+  while$
+}
+
+FUNCTION {format.date}
+{ year empty$
+    { month empty$
+	{ "" }
+	{ "there's a month but no year in " cite$ * warning$
+	  month
+	}
+      if$
+    }
+    { month empty$
+	'year
+	{ month " " * year * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.btitle}
+{ title emphasize
+}
+
+FUNCTION {tie.or.space.connect}
+{ duplicate$ text.length$ #3 <
+    { "~" }
+    { " " }
+  if$
+  swap$ * *
+}
+
+FUNCTION {either.or.check}
+{ empty$
+    'pop$
+    { "can't use both " swap$ * " fields in " * cite$ * warning$ }
+  if$
+}
+
+FUNCTION {format.bvolume}
+{ volume empty$
+    { "" }
+    { "vol.~" volume *
+      series empty$
+	'skip$
+	{ " of " * series * }
+      if$
+      "volume and number" number either.or.check
+    }
+  if$
+}
+
+FUNCTION {format.number.series}
+{ volume empty$
+    { number empty$
+	{ series field.or.null }
+	{ "no.~" number *
+	  series empty$
+	    { "there's a number but no series in " cite$ * warning$ }
+	    { " in " * series * }
+	  if$
+	}
+      if$
+    }
+    { "" }
+  if$
+}
+
+FUNCTION {format.edition}
+{ edition empty$
+    { "" }
+    { edition "l" change.case$ "~ed." * }
+  if$
+}
+
+INTEGERS { multiresult }
+
+FUNCTION {multi.page.check}
+{ 't :=
+  #0 'multiresult :=
+    { multiresult not
+      t empty$ not
+      and
+    }
+    { t #1 #1 substring$
+      duplicate$ "-" =
+      swap$ duplicate$ "," =
+      swap$ "+" =
+      or or
+	{ #1 'multiresult := }
+	{ t #2 global.max$ substring$ 't := }
+      if$
+    }
+  while$
+  multiresult
+}
+
+FUNCTION {format.pages}
+{ pages empty$
+    { "" }
+    { pages multi.page.check
+	{ "pp.~" pages n.dashify * }
+	{ "p.~" pages * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.vol.year}
+{ volume field.or.null
+  year empty$
+    { "empty year in " cite$ * warning$ }
+    { " (" year * ")" * * }
+  if$
+}
+
+FUNCTION {format.chapter.pages}
+{ chapter empty$
+    'format.pages
+    { type empty$
+	{ "ch.~" chapter * }
+	{ type "l" change.case$ chapter tie.or.space.connect }
+      if$
+      pages empty$
+	'skip$
+	{ ", " * format.pages * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.in.ed.booktitle}
+{ booktitle empty$
+    { "" }
+    { editor empty$
+	{ "in " booktitle * }
+	{ "in " booktitle * ", " * format.ineditors * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {empty.misc.check}
+{ author empty$ title empty$ howpublished empty$
+  month empty$ year empty$ note empty$
+  and and and and and
+  key empty$ not and
+    { "all relevant fields are empty in " cite$ * warning$ }
+    'skip$
+  if$
+}
+
+FUNCTION {format.thesis.type}
+{ type empty$
+    'skip$
+    { pop$
+      type "l" change.case$
+    }
+  if$
+}
+
+FUNCTION {format.tr.number}
+{ type empty$
+    { "Tech. Rep." }
+    'type
+  if$
+  number empty$
+    { "l" change.case$ }
+    { number tie.or.space.connect }
+  if$
+}
+
+FUNCTION {format.article.crossref}
+{ key empty$
+    { journal empty$
+	{ "need key or journal for " cite$ * " to crossref " * crossref *
+	  warning$
+	  ""
+	}
+	{ "in " journal * }
+      if$
+    }
+    { "in " key * }
+  if$
+  " \cite{" * crossref * "}" *
+}
+
+FUNCTION {format.crossref.editor}
+{ editor #1 "{vv~}{ll}" format.name$
+  editor num.names$ duplicate$
+  #2 >
+    { pop$ " et~al." * }
+    { #2 <
+	'skip$
+	{ editor #2 "{ff }{vv }{ll}{ jj}" format.name$ "others" =
+	    { " et~al." * }
+	    { " and " * editor #2 "{vv~}{ll}" format.name$ * }
+	  if$
+	}
+      if$
+    }
+  if$
+}
+
+FUNCTION {format.book.crossref}
+{ volume empty$
+    { "empty volume in " cite$ * "'s crossref of " * crossref * warning$
+      "in "
+    }
+    { "vol.~" volume *
+      " of " *
+    }
+  if$
+  editor empty$
+  editor field.or.null author field.or.null =
+  or
+    { key empty$
+	{ series empty$
+	    { "need editor, key, or series for " cite$ * " to crossref " *
+	      crossref * warning$
+	      "" *
+	    }
+	    { series * }
+	  if$
+	}
+	{ key * }
+      if$
+    }
+    { format.crossref.editor * }
+  if$
+  " \cite{" * crossref * "}" *
+}
+
+FUNCTION {format.incoll.inproc.crossref}
+{ editor empty$
+  editor field.or.null author field.or.null =
+  or
+    { key empty$
+	{ booktitle empty$
+	    { "need editor, key, or booktitle for " cite$ * " to crossref " *
+	      crossref * warning$
+	      ""
+	    }
+	    { "in " booktitle * }
+	  if$
+	}
+	{ "in " key * }
+      if$
+    }
+    { "in " format.crossref.editor * }
+  if$
+  " \cite{" * crossref * "}" *
+}
+
+FUNCTION {article}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  format.title "title" output.check
+  crossref missing$
+    { journal "journal" output.check
+      format.vol.year output
+    }
+    { format.article.crossref output.nonnull }
+  if$
+  format.pages output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {book}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  author empty$
+    { format.editors "author and editor" output.check }
+    { format.authors output.nonnull
+      crossref missing$
+	{ "author and editor" editor either.or.check }
+	'skip$
+      if$
+    }
+  if$
+  format.btitle "title" output.check
+  crossref missing$
+    { format.bvolume output
+      format.number.series output
+      publisher "publisher" output.check
+      address output
+    }
+    { format.book.crossref output.nonnull }
+  if$
+  format.edition output
+  format.date "year" output.check
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {booklet}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors output
+  format.title "title" output.check
+  howpublished new.block.checka
+  howpublished output
+  address output
+  format.date output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {inbook}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  author empty$
+    { format.editors "author and editor" output.check }
+    { format.authors output.nonnull
+      crossref missing$
+	{ "author and editor" editor either.or.check }
+	'skip$
+      if$
+    }
+  if$
+  format.btitle "title" output.check
+  crossref missing$
+    { format.bvolume output
+      format.number.series output
+      publisher "publisher" output.check
+      address output
+    }
+    { format.book.crossref output.nonnull }
+  if$
+  format.edition output
+  format.date "year" output.check
+  format.chapter.pages "chapter and pages" output.check
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {incollection}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  format.title "title" output.check
+  crossref missing$
+    { format.in.ed.booktitle "booktitle" output.check
+      format.bvolume output
+      format.number.series output
+      publisher "publisher" output.check
+      address output
+      format.edition output
+      format.date "year" output.check
+    }
+    { format.incoll.inproc.crossref output.nonnull }
+  if$
+  format.chapter.pages output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {inproceedings}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  format.title "title" output.check
+  crossref missing$
+    { format.in.ed.booktitle "booktitle" output.check
+      format.bvolume output
+      format.number.series output
+      address empty$
+	{ organization output
+	  publisher output
+	  format.date "year" output.check
+	}
+	{ address output.nonnull
+	  format.date "year" output.check
+	  organization output
+	  publisher output
+	}
+      if$
+    }
+    { format.incoll.inproc.crossref output.nonnull }
+  if$
+  format.pages output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {conference} { inproceedings }
+
+FUNCTION {manual}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  author empty$
+    { format.organization output }
+    { format.authors output.nonnull }
+  if$
+  format.btitle "title" output.check
+  author empty$
+    'skip$
+    { organization output }
+  if$
+  address output
+  format.edition output
+  format.date output
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {mastersthesis}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  format.title "title" output.check
+  "Master's thesis" format.thesis.type output.nonnull
+  school "school" output.check
+  address output
+  format.date "year" output.check
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {misc}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors output
+  format.title output
+  howpublished new.block.checka
+  howpublished output
+  format.date output
+  new.block
+  note output
+  fin.entry
+  empty.misc.check
+}
+
+FUNCTION {phdthesis}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  format.btitle "title" output.check
+  "PhD thesis" format.thesis.type output.nonnull
+  school "school" output.check
+  address output
+  format.date "year" output.check
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {proceedings}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  editor empty$
+    { format.organization output }
+    { format.editors output.nonnull }
+  if$
+  format.btitle "title" output.check
+  format.bvolume output
+  format.number.series output
+  address empty$
+    { editor empty$
+	'skip$
+	{ organization output }
+      if$
+      publisher output
+      format.date "year" output.check
+    }
+    { address output.nonnull
+      format.date "year" output.check
+      editor empty$
+	'skip$
+	{ organization output }
+      if$
+      publisher output
+    }
+  if$
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {techreport}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  format.title "title" output.check
+  format.tr.number output.nonnull
+  institution "institution" output.check
+  address output
+  format.date "year" output.check
+  new.block
+  note output
+  fin.entry
+}
+
+FUNCTION {unpublished}
+{ find.firstletter
+  output.letter
+  output.bibitem
+  format.authors "author" output.check
+  format.title "title" output.check
+  new.block
+  note "note" output.check
+  format.date output
+  fin.entry
+}
+
+FUNCTION {default.type} { misc }
+
+MACRO {jan} {"Jan."}
+
+MACRO {feb} {"Feb."}
+
+MACRO {mar} {"Mar."}
+
+MACRO {apr} {"Apr."}
+
+MACRO {may} {"May"}
+
+MACRO {jun} {"June"}
+
+MACRO {jul} {"July"}
+
+MACRO {aug} {"Aug."}
+
+MACRO {sep} {"Sept."}
+
+MACRO {oct} {"Oct."}
+
+MACRO {nov} {"Nov."}
+
+MACRO {dec} {"Dec."}
+
+MACRO {acmcs} {"ACM Comput. Surveys"}
+
+MACRO {acta} {"Acta Inf."}
+
+MACRO {cacm} {"Comm. ACM"}
+
+MACRO {ibmjrd} {"IBM J. Res. Dev."}
+
+MACRO {ibmsj} {"IBM Syst.~J."}
+
+MACRO {ieeese} {"IEEE Trans. Softw. Eng."}
+
+MACRO {ieeetc} {"IEEE Trans. Comput."}
+
+MACRO {ieeetcad}
+ {"IEEE Trans. Comput.-Aided Design Integrated Circuits"}
+
+MACRO {ipl} {"Inf. Process. Lett."}
+
+MACRO {jacm} {"J.~Assoc. Comput. Mach."}
+
+MACRO {jcss} {"J.~Comput. System Sci."}
+
+MACRO {scp} {"Sci. Comput. Programming"}
+
+MACRO {sicomp} {"SIAM J. Comput."}
+
+MACRO {tocs} {"ACM Trans. Comput. Syst."}
+
+MACRO {tods} {"ACM Trans. Database Syst."}
+
+MACRO {tog} {"ACM Trans. Gr."}
+
+MACRO {toms} {"ACM Trans. Math. Softw."}
+
+MACRO {toois} {"ACM Trans. Office Inf. Syst."}
+
+MACRO {toplas} {"ACM Trans. Prog. Lang. Syst."}
+
+MACRO {tcs} {"Theoretical Comput. Sci."}
+
+READ
+
+FUNCTION {sortify}
+{ purify$
+  "l" change.case$
+}
+
+INTEGERS { len }
+
+FUNCTION {chop.word}
+{ 's :=
+  'len :=
+  s #1 len substring$ =
+    { s len #1 + global.max$ substring$ }
+    's
+  if$
+}
+
+FUNCTION {sort.format.names}
+{ 's :=
+  #1 'nameptr :=
+  ""
+  s num.names$ 'numnames :=
+  numnames 'namesleft :=
+    { namesleft #0 > }
+    { nameptr #1 >
+	{ "   " * }
+	'skip$
+      if$
+      s nameptr "{vv{ } }{ll{ }}{  f{ }}{  jj{ }}" format.name$ 't :=
+      nameptr numnames = t "others" = and
+	{ "et al" * }
+	{ t sortify * }
+      if$
+      nameptr #1 + 'nameptr :=
+      namesleft #1 - 'namesleft :=
+    }
+  while$
+}
+
+FUNCTION {sort.format.title}
+{ 't :=
+  "A " #2
+    "An " #3
+      "The " #4 t chop.word
+    chop.word
+  chop.word
+  sortify
+  #1 global.max$ substring$
+}
+
+FUNCTION {author.sort}
+{ author empty$
+    { key empty$
+	{ "to sort, need author or key in " cite$ * warning$
+	  ""
+	}
+	{ key sortify }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+
+FUNCTION {author.editor.sort}
+{ author empty$
+    { editor empty$
+	{ key empty$
+	    { "to sort, need author, editor, or key in " cite$ * warning$
+	      ""
+	    }
+	    { key sortify }
+	  if$
+	}
+	{ editor sort.format.names }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+
+FUNCTION {author.organization.sort}
+{ author empty$
+    { organization empty$
+	{ key empty$
+	    { "to sort, need author, organization, or key in " cite$ * warning$
+	      ""
+	    }
+	    { key sortify }
+	  if$
+	}
+	{ "The " #4 organization chop.word sortify }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+
+FUNCTION {editor.organization.sort}
+{ editor empty$
+    { organization empty$
+	{ key empty$
+	    { "to sort, need editor, organization, or key in " cite$ * warning$
+	      ""
+	    }
+	    { key sortify }
+	  if$
+	}
+	{ "The " #4 organization chop.word sortify }
+      if$
+    }
+    { editor sort.format.names }
+  if$
+}
+
+FUNCTION {presort}
+{ type$ "book" =
+  type$ "inbook" =
+  or
+    'author.editor.sort
+    { type$ "proceedings" =
+	'editor.organization.sort
+	{ type$ "manual" =
+	    'author.organization.sort
+	    'author.sort
+	  if$
+	}
+      if$
+    }
+  if$
+  "    "
+  *
+  year field.or.null sortify
+  *
+  "    "
+  *
+  title field.or.null
+  sort.format.title
+  *
+  #1 entry.max$ substring$
+  'sort.key$ :=
+}
+
+ITERATE {presort}
+
+SORT
+
+STRINGS { longest.label }
+
+INTEGERS { number.label longest.label.width }
+
+FUNCTION {initialize.longest.label}
+{ "" 'longest.label :=
+  "\" 'cur.letter :=
+  #1 'first.letter.place :=
+  #1 'number.label :=
+  #0 'longest.label.width :=
+}
+
+FUNCTION { def.alphabibitem }
+{ "\def\alphabibitem#1{%" write$ newline$
+  "\expandafter\ifx\csname firstalphabibitem\endcsname" write$ newline$
+  "\relax\def\firstalphabibitem{}" write$ newline$
+  "\else\expandafter" write$ newline$
+  "\ifx\csname alphabibitemskip\endcsname" write$ newline$
+  "\relax\bigskip" write$ newline$
+  "\else\alphabibitemskip" write$ newline$
+  "\fi" write$ newline$
+  "\fi" write$ newline$
+  "\penalty-200\expandafter" write$ newline$
+  "\ifx\csname alphabibitemlabel\endcsname" write$ newline$
+  "\relax\expandafter" write$ newline$
+  "\ifx\csname alphabibitemcontent\endcsname\relax" write$ newline$
+  "\item[\LARGE\bfseries\MakeUppercase{#1}]" write$ newline$
+  "\hfill\vskip 1ex\hrule\medskip" write$ newline$
+  "\else\item[\Large\bfseries\MakeUppercase{#1}]" write$ newline$
+  "\alphabibitemcontent{\MakeUppercase{#1}}%" write$ newline$
+  "\fi" write$ newline$
+  "\else\expandafter" write$ newline$
+  "\ifx\csname alphabibitemcontent\endcsname\relax" write$ newline$
+  "\item[\alphabibitemlabel{\MakeUppercase{#1}}]" write$ newline$
+  "\vskip 1ex\hrule\medskip" write$ newline$
+  "\else\item[\alphabibitemlabel{\MakeUppercase{#1}}]" write$ newline$
+  "\alphabibitemcontent{\MakeUppercase{#1}}%" write$ newline$
+  "\fi" write$ newline$
+  "\fi}" write$ newline$
+   newline$
+}
+
+FUNCTION {longest.label.pass}
+{ number.label int.to.str$ 'label :=
+  number.label #1 + 'number.label :=
+  label width$ longest.label.width >
+    { label 'longest.label :=
+      label width$ 'longest.label.width :=
+    }
+    'skip$
+  if$
+}
+
+EXECUTE {initialize.longest.label}
+
+ITERATE {longest.label.pass}
+
+FUNCTION {begin.bib}
+{ preamble$ empty$
+    'skip$
+    { preamble$ write$ newline$ }
+  if$
+  def.alphabibitem
+  "\begin{thebibliography}{"  longest.label  * "}" * write$ newline$
+}
+
+EXECUTE {begin.bib}
+
+EXECUTE {init.state.consts}
+
+EXECUTE {init.last.authors}
+
+ITERATE {call.type$}
+
+FUNCTION {end.bib}
+{ newline$
+  "\end{thebibliography}" write$ newline$
+}
+
+EXECUTE {end.bib}
diff --git a/Master/texmf-dist/doc/latex/sort-by-letters/README b/Master/texmf-dist/doc/latex/sort-by-letters/README
new file mode 100644
index 00000000000..f61307d91aa
--- /dev/null
+++ b/Master/texmf-dist/doc/latex/sort-by-letters/README
@@ -0,0 +1,31 @@
+This is an archive for bibliography style files :
+abbrv-letters.bst
+alpha-letters.bst
+apalike-letters.bst
+frplainnat-letters.bst
+plain-letters.bst
+plainnat-letters.bst
+siam-letters.bst
+
+(C) 2006 - Thomas van Oudenhove <vanouden@enstimac.fr>
+Copying of this file is authorized only if either
+ (1) you make absolutely no changes to your copy, including name, or
+ (2) if you do make changes, you name it something other than all
+     standard styles' names (for consistency reasons).  
+
+these styles do the same stuff as the original files, but they write
+in the bbl file the first letter of the first author or editor
+name. the references in the bibliography are thus sorted by letter,
+like this :
+A___
+Aamport,...
+K___
+Knuth, ...
+
+Known bugs : 
+  - sorting doesn't work with 'organization'
+  - 'odd encoding' are not supported, especially with accents
+  (e.g. \"U will go with the U, but Ü will not be supported... and may
+  go with the next letter)
+
+Enjoy !
diff --git a/Master/texmf-dist/tpm/sort-by-letters.tpm b/Master/texmf-dist/tpm/sort-by-letters.tpm
new file mode 100644
index 00000000000..0c0576d030c
--- /dev/null
+++ b/Master/texmf-dist/tpm/sort-by-letters.tpm
@@ -0,0 +1,28 @@
+<!DOCTYPE rdf:RDF SYSTEM "../../support/tpm.dtd">
+<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:TPM="http://texlive.dante.de/">
+  <rdf:Description about="http://texlive.dante.de/texlive/Package/sort-by-letters.zip">
+    <TPM:Name>sort-by-letters</TPM:Name>
+    <TPM:Type>Package</TPM:Type>
+    <TPM:Date>2006/04/24 08:45:00</TPM:Date>
+    <TPM:Version></TPM:Version>
+    <TPM:Creator>karl</TPM:Creator>
+    <TPM:Title>The sort-by-letters package.</TPM:Title>
+    <TPM:Description></TPM:Description>
+    <TPM:Author></TPM:Author>
+    <TPM:Size>180283</TPM:Size>
+    <TPM:Build/>
+    <TPM:RunFiles size="180557">
+texmf-dist/bibtex/bst/sort-by-letters/abbrv-letters.bst
+texmf-dist/bibtex/bst/sort-by-letters/alpha-letters.bst
+texmf-dist/bibtex/bst/sort-by-letters/apalike-letters.bst
+texmf-dist/bibtex/bst/sort-by-letters/frplainnat-letters.bst
+texmf-dist/bibtex/bst/sort-by-letters/plain-letters.bst
+texmf-dist/bibtex/bst/sort-by-letters/plainnat-letters.bst
+texmf-dist/bibtex/bst/sort-by-letters/siam-letters.bst
+texmf-dist/tpm/sort-by-letters.tpm
+    </TPM:RunFiles>
+    <TPM:DocFiles size="958">texmf-dist/doc/latex/sort-by-letters/README</TPM:DocFiles>
+    <TPM:Provides>Package/sort-by-letters</TPM:Provides>
+  </rdf:Description>
+</rdf:RDF>
+
diff --git a/Master/texmf/lists/sort-by-letters b/Master/texmf/lists/sort-by-letters
new file mode 100644
index 00000000000..1a59f891004
--- /dev/null
+++ b/Master/texmf/lists/sort-by-letters
@@ -0,0 +1,12 @@
+texmf-dist/doc/latex/sort-by-letters/README
+
+texmf-dist/bibtex/bst/sort-by-letters/abbrv-letters.bst
+texmf-dist/bibtex/bst/sort-by-letters/alpha-letters.bst
+texmf-dist/bibtex/bst/sort-by-letters/apalike-letters.bst
+texmf-dist/bibtex/bst/sort-by-letters/frplainnat-letters.bst
+texmf-dist/bibtex/bst/sort-by-letters/plain-letters.bst
+texmf-dist/bibtex/bst/sort-by-letters/plainnat-letters.bst
+texmf-dist/bibtex/bst/sort-by-letters/siam-letters.bst
+texmf-dist/tpm/sort-by-letters.tpm
+
+texmf/lists/sort-by-letters
diff --git a/Master/texmf/tpm/collection-bibtexextra.tpm b/Master/texmf/tpm/collection-bibtexextra.tpm
index cd59dfe1a9e..51df0fc9941 100644
--- a/Master/texmf/tpm/collection-bibtexextra.tpm
+++ b/Master/texmf/tpm/collection-bibtexextra.tpm
@@ -37,6 +37,7 @@ Additional BibTeX styles and bibliography databases.
       <TPM:Package name="multibib"/>
       <TPM:Package name="perception"/>
       <TPM:Package name="rsc"/>
+      <TPM:Package name="sort-by-letters"/>
       <TPM:Package name="urlbst"/>
       <TPM:TLCore name="collection-latex"/>
     </TPM:Requires>