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+%%
+%% IEEEtranSN.bst
+%% BibTeX Bibliography Style file
+%% Sorting Natbib version of IEEEtran.bst
+%% *** Not for normal IEEE work ***
+%% Version 1.13 (2008/09/30)
+%% 
+%% Copyright (c) 2003-2008 Michael Shell
+%% 
+%% Original starting code base and algorithms obtained from the output of
+%% Patrick W. Daly's makebst package as well as from prior versions of
+%% IEEE BibTeX styles:
+%% 
+%% 1. Howard Trickey and Oren Patashnik's ieeetr.bst  (1985/1988)
+%% 2. Silvano Balemi and Richard H. Roy's IEEEbib.bst (1993)
+%% 
+%% Added sorting and natbib code is from Patrick W Daly's plainnat.bst
+%% and Oren Patashnik's plain.bst.
+%% 
+%% 
+%% Support sites:
+%% http://www.michaelshell.org/tex/ieeetran/
+%% http://www.ctan.org/tex-archive/macros/latex/contrib/IEEEtran/
+%% and/or
+%% http://www.ieee.org/
+%% 
+%% For use with BibTeX version 0.99a or later
+%%
+%% This is a natbib compatible citation style.
+%% 
+%%*************************************************************************
+%% Legal Notice:
+%% This code is offered as-is without any warranty either expressed or
+%% implied; without even the implied warranty of MERCHANTABILITY or
+%% FITNESS FOR A PARTICULAR PURPOSE! 
+%% User assumes all risk.
+%% In no event shall IEEE or any contributor to this code be liable for
+%% any damages or losses, including, but not limited to, incidental,
+%% consequential, or any other damages, resulting from the use or misuse
+%% of any information contained here.
+%%
+%% All comments are the opinions of their respective authors and are not
+%% necessarily endorsed by the IEEE.
+%%
+%% This work is distributed under the LaTeX Project Public License (LPPL)
+%% ( http://www.latex-project.org/ ) version 1.3, and may be freely used,
+%% distributed and modified. A copy of the LPPL, version 1.3, is included
+%% in the base LaTeX documentation of all distributions of LaTeX released
+%% 2003/12/01 or later.
+%% Retain all contribution notices and credits.
+%% ** Modified files should be clearly indicated as such, including  **
+%% ** renaming them and changing author support contact information. **
+%%
+%% File list of work: IEEEabrv.bib, IEEEfull.bib, IEEEexample.bib,
+%%                    IEEEtran.bst, IEEEtranS.bst, IEEEtranSA.bst,
+%%                    IEEEtranN.bst, IEEEtranSN.bst, IEEEtran_bst_HOWTO.pdf
+%%*************************************************************************
+%
+%
+% Changelog:
+%
+% 1.12 (2007/01/11) Initial release
+%
+% 1.13 (2008/09/30)
+%  1. Fixed bug with edition number to ordinal conversion. Thanks to
+%     Michael Roland for reporting this and correcting the algorithm.
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% DEFAULTS FOR THE CONTROLS OF THE BST STYLE %%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+% These are the defaults for the user adjustable controls. The values used
+% here can be overridden by the user via IEEEtranBSTCTL entry type.
+
+% NOTE: The recommended LaTeX command to invoke a control entry type is:
+% 
+%\makeatletter
+%\def\bstctlcite{\@ifnextchar[{\@bstctlcite}{\@bstctlcite[@auxout]}}
+%\def\@bstctlcite[#1]#2{\@bsphack
+%  \@for\@citeb:=#2\do{%
+%    \edef\@citeb{\expandafter\@firstofone\@citeb}%
+%    \if@filesw\immediate\write\csname #1\endcsname{\string\citation{\@citeb}}\fi}%
+%  \@esphack}
+%\makeatother
+%
+% It is called at the start of the document, before the first \cite, like:
+% \bstctlcite{IEEEexample:BSTcontrol}
+%
+% IEEEtran.cls V1.6 and later does provide this command.
+
+
+
+% #0 turns off the display of the number for articles.
+% #1 enables
+FUNCTION {default.is.use.number.for.article} { #1 }
+
+
+% #0 turns off the display of the paper and type fields in @inproceedings.
+% #1 enables
+FUNCTION {default.is.use.paper} { #1 }
+
+
+% #0 turns off the forced use of "et al."
+% #1 enables
+FUNCTION {default.is.forced.et.al} { #0 }
+
+% The maximum number of names that can be present beyond which an "et al."
+% usage is forced. Be sure that num.names.shown.with.forced.et.al (below)
+% is not greater than this value!
+% Note: There are many instances of references in IEEE journals which have
+% a very large number of authors as well as instances in which "et al." is
+% used profusely.
+FUNCTION {default.max.num.names.before.forced.et.al} { #10 }
+
+% The number of names that will be shown with a forced "et al.".
+% Must be less than or equal to max.num.names.before.forced.et.al
+FUNCTION {default.num.names.shown.with.forced.et.al} { #1 }
+
+
+% #0 turns off the alternate interword spacing for entries with URLs.
+% #1 enables
+FUNCTION {default.is.use.alt.interword.spacing} { #1 }
+
+% If alternate interword spacing for entries with URLs is enabled, this is
+% the interword spacing stretch factor that will be used. For example, the
+% default "4" here means that the interword spacing in entries with URLs can
+% stretch to four times normal. Does not have to be an integer. Note that
+% the value specified here can be overridden by the user in their LaTeX
+% code via a command such as: 
+% "\providecommand\BIBentryALTinterwordstretchfactor{1.5}" in addition to
+% that via the IEEEtranBSTCTL entry type.
+FUNCTION {default.ALTinterwordstretchfactor} { "4" }
+
+
+% #0 turns off the "dashification" of repeated (i.e., identical to those
+% of the previous entry) names. IEEE normally does this.
+% #1 enables
+FUNCTION {default.is.dash.repeated.names} { #1 }
+
+
+% The default name format control string.
+FUNCTION {default.name.format.string}{ "{f.~}{vv~}{ll}{, jj}" }
+
+
+% The default LaTeX font command for the names.
+FUNCTION {default.name.latex.cmd}{ "" }
+
+
+% The default URL prefix.
+FUNCTION {default.name.url.prefix}{ "[Online]. Available:" }
+
+
+% Other controls that cannot be accessed via IEEEtranBSTCTL entry type.
+
+% #0 turns off the terminal startup banner/completed message so as to
+% operate more quietly.
+% #1 enables
+FUNCTION {is.print.banners.to.terminal} { #1 }
+
+
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% FILE VERSION AND BANNER %%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+FUNCTION{bst.file.version} { "1.13" }
+FUNCTION{bst.file.date} { "2008/09/30" }
+FUNCTION{bst.file.website} { "http://www.michaelshell.org/tex/ieeetran/bibtex/" }
+
+FUNCTION {banner.message}
+{ is.print.banners.to.terminal
+     { "-- IEEEtranSN.bst version" " " * bst.file.version *
+       " (" * bst.file.date * ") " * "by Michael Shell." *
+       top$
+       "-- " bst.file.website *
+       top$
+       "-- See the " quote$ * "IEEEtran_bst_HOWTO.pdf" * quote$ * " manual for usage information." *
+       top$
+       "** Sorting Natbib version - not for normal IEEE work."
+       top$
+     }
+     { skip$ }
+   if$
+}
+
+FUNCTION {completed.message}
+{ is.print.banners.to.terminal
+     { ""
+       top$
+       "Done."
+       top$
+     }
+     { skip$ }
+   if$
+}
+
+
+
+
+%%%%%%%%%%%%%%%%%%%%%%
+%% STRING CONSTANTS %%
+%%%%%%%%%%%%%%%%%%%%%%
+
+FUNCTION {bbl.and}{ "and" }
+FUNCTION {bbl.etal}{ "et~al." }
+FUNCTION {bbl.editors}{ "eds." }
+FUNCTION {bbl.editor}{ "ed." }
+FUNCTION {bbl.edition}{ "ed." }
+FUNCTION {bbl.volume}{ "vol." }
+FUNCTION {bbl.of}{ "of" }
+FUNCTION {bbl.number}{ "no." }
+FUNCTION {bbl.in}{ "in" }
+FUNCTION {bbl.pages}{ "pp." }
+FUNCTION {bbl.page}{ "p." }
+FUNCTION {bbl.chapter}{ "ch." }
+FUNCTION {bbl.paper}{ "paper" }
+FUNCTION {bbl.part}{ "pt." }
+FUNCTION {bbl.patent}{ "Patent" }
+FUNCTION {bbl.patentUS}{ "U.S." }
+FUNCTION {bbl.revision}{ "Rev." }
+FUNCTION {bbl.series}{ "ser." }
+FUNCTION {bbl.standard}{ "Std." }
+FUNCTION {bbl.techrep}{ "Tech. Rep." }
+FUNCTION {bbl.mthesis}{ "Master's thesis" }
+FUNCTION {bbl.phdthesis}{ "Ph.D. dissertation" }
+FUNCTION {bbl.st}{ "st" }
+FUNCTION {bbl.nd}{ "nd" }
+FUNCTION {bbl.rd}{ "rd" }
+FUNCTION {bbl.th}{ "th" }
+
+
+% This is the LaTeX spacer that is used when a larger than normal space
+% is called for (such as just before the address:publisher).
+FUNCTION {large.space} { "\hskip 1em plus 0.5em minus 0.4em\relax " }
+
+% The LaTeX code for dashes that are used to represent repeated names.
+% Note: Some older IEEE journals used something like
+% "\rule{0.275in}{0.5pt}\," which is fairly thick and runs right along
+% the baseline. However, IEEE now uses a thinner, above baseline,
+% six dash long sequence.
+FUNCTION {repeated.name.dashes} { "------" }
+
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% PREDEFINED STRING MACROS %%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+MACRO {jan} {"Jan."}
+MACRO {feb} {"Feb."}
+MACRO {mar} {"Mar."}
+MACRO {apr} {"Apr."}
+MACRO {may} {"May"}
+MACRO {jun} {"Jun."}
+MACRO {jul} {"Jul."}
+MACRO {aug} {"Aug."}
+MACRO {sep} {"Sep."}
+MACRO {oct} {"Oct."}
+MACRO {nov} {"Nov."}
+MACRO {dec} {"Dec."}
+
+
+
+%%%%%%%%%%%%%%%%%%
+%% ENTRY FIELDS %%
+%%%%%%%%%%%%%%%%%%
+
+ENTRY
+  { address
+    assignee
+    author
+    booktitle
+    chapter
+    day
+    dayfiled
+    edition
+    editor
+    howpublished
+    institution
+    intype
+    journal
+    key
+    language
+    month
+    monthfiled
+    nationality
+    note
+    number
+    organization
+    pages
+    paper
+    publisher
+    school
+    series
+    revision
+    title
+    type
+    url
+    volume
+    year
+    yearfiled
+    CTLuse_article_number
+    CTLuse_paper
+    CTLuse_forced_etal
+    CTLmax_names_forced_etal
+    CTLnames_show_etal
+    CTLuse_alt_spacing
+    CTLalt_stretch_factor
+    CTLdash_repeated_names
+    CTLname_format_string
+    CTLname_latex_cmd
+    CTLname_url_prefix
+  }
+  {}
+  { label extra.label sort.label short.list}
+
+
+
+
+%%%%%%%%%%%%%%%%%%%%%%%
+%% INTEGER VARIABLES %%
+%%%%%%%%%%%%%%%%%%%%%%%
+
+INTEGERS { prev.status.punct this.status.punct punct.std
+           punct.no punct.comma punct.period 
+           prev.status.space this.status.space space.std
+           space.no space.normal space.large
+           prev.status.quote this.status.quote quote.std
+           quote.no quote.close
+           prev.status.nline this.status.nline nline.std
+           nline.no nline.newblock 
+           status.cap cap.std
+           cap.no cap.yes}
+
+INTEGERS { longest.label.width multiresult nameptr namesleft number.label numnames }
+
+INTEGERS { is.use.number.for.article
+           is.use.paper
+           is.forced.et.al
+           max.num.names.before.forced.et.al
+           num.names.shown.with.forced.et.al
+           is.use.alt.interword.spacing
+           is.dash.repeated.names}
+
+
+%%%%%%%%%%%%%%%%%%%%%%
+%% STRING VARIABLES %%
+%%%%%%%%%%%%%%%%%%%%%%
+
+STRINGS { bibinfo
+          longest.label
+          oldname
+          s
+          t
+          ALTinterwordstretchfactor
+          name.format.string
+          name.latex.cmd
+          name.url.prefix}
+
+
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%
+%% LOW LEVEL FUNCTIONS %%
+%%%%%%%%%%%%%%%%%%%%%%%%%
+
+FUNCTION {initialize.controls}
+{ default.is.use.number.for.article 'is.use.number.for.article :=
+  default.is.use.paper 'is.use.paper :=
+  default.is.forced.et.al 'is.forced.et.al :=
+  default.max.num.names.before.forced.et.al 'max.num.names.before.forced.et.al :=
+  default.num.names.shown.with.forced.et.al 'num.names.shown.with.forced.et.al :=
+  default.is.use.alt.interword.spacing 'is.use.alt.interword.spacing :=
+  default.is.dash.repeated.names 'is.dash.repeated.names :=
+  default.ALTinterwordstretchfactor 'ALTinterwordstretchfactor :=
+  default.name.format.string 'name.format.string :=
+  default.name.latex.cmd 'name.latex.cmd :=
+  default.name.url.prefix 'name.url.prefix :=
+}
+
+
+% This IEEEtran.bst features a very powerful and flexible mechanism for
+% controlling the capitalization, punctuation, spacing, quotation, and
+% newlines of the formatted entry fields. (Note: IEEEtran.bst does not need
+% or use the newline/newblock feature, but it has been implemented for
+% possible future use.) The output states of IEEEtran.bst consist of
+% multiple independent attributes and, as such, can be thought of as being
+% vectors, rather than the simple scalar values ("before.all", 
+% "mid.sentence", etc.) used in most other .bst files.
+% 
+% The more flexible and complex design used here was motivated in part by
+% IEEE's rather unusual bibliography style. For example, IEEE ends the
+% previous field item with a period and large space prior to the publisher
+% address; the @electronic entry types use periods as inter-item punctuation
+% rather than the commas used by the other entry types; and URLs are never
+% followed by periods even though they are the last item in the entry.
+% Although it is possible to accommodate these features with the conventional
+% output state system, the seemingly endless exceptions make for convoluted,
+% unreliable and difficult to maintain code.
+%
+% IEEEtran.bst's output state system can be easily understood via a simple
+% illustration of two most recently formatted entry fields (on the stack):
+%
+%               CURRENT_ITEM
+%               "PREVIOUS_ITEM
+%
+% which, in this example, is to eventually appear in the bibliography as:
+% 
+%               "PREVIOUS_ITEM," CURRENT_ITEM
+%
+% It is the job of the output routine to take the previous item off of the
+% stack (while leaving the current item at the top of the stack), apply its
+% trailing punctuation (including closing quote marks) and spacing, and then
+% to write the result to BibTeX's output buffer:
+% 
+%               "PREVIOUS_ITEM," 
+% 
+% Punctuation (and spacing) between items is often determined by both of the
+% items rather than just the first one. The presence of quotation marks
+% further complicates the situation because, in standard English, trailing
+% punctuation marks are supposed to be contained within the quotes.
+% 
+% IEEEtran.bst maintains two output state (aka "status") vectors which
+% correspond to the previous and current (aka "this") items. Each vector
+% consists of several independent attributes which track punctuation,
+% spacing, quotation, and newlines. Capitalization status is handled by a
+% separate scalar because the format routines, not the output routine,
+% handle capitalization and, therefore, there is no need to maintain the
+% capitalization attribute for both the "previous" and "this" items.
+% 
+% When a format routine adds a new item, it copies the current output status
+% vector to the previous output status vector and (usually) resets the
+% current (this) output status vector to a "standard status" vector. Using a
+% "standard status" vector in this way allows us to redefine what we mean by
+% "standard status" at the start of each entry handler and reuse the same
+% format routines under the various inter-item separation schemes. For
+% example, the standard status vector for the @book entry type may use
+% commas for item separators, while the @electronic type may use periods,
+% yet both entry handlers exploit many of the exact same format routines.
+% 
+% Because format routines have write access to the output status vector of
+% the previous item, they can override the punctuation choices of the
+% previous format routine! Therefore, it becomes trivial to implement rules
+% such as "Always use a period and a large space before the publisher." By
+% pushing the generation of the closing quote mark to the output routine, we
+% avoid all the problems caused by having to close a quote before having all
+% the information required to determine what the punctuation should be.
+%
+% The IEEEtran.bst output state system can easily be expanded if needed.
+% For instance, it is easy to add a "space.tie" attribute value if the
+% bibliography rules mandate that two items have to be joined with an
+% unbreakable space. 
+
+FUNCTION {initialize.status.constants}
+{ #0 'punct.no :=
+  #1 'punct.comma :=
+  #2 'punct.period :=
+  #0 'space.no := 
+  #1 'space.normal :=
+  #2 'space.large :=
+  #0 'quote.no :=
+  #1 'quote.close :=
+  #0 'cap.no :=
+  #1 'cap.yes :=
+  #0 'nline.no :=
+  #1 'nline.newblock :=
+}
+
+FUNCTION {std.status.using.comma}
+{ punct.comma 'punct.std :=
+  space.normal 'space.std :=
+  quote.no 'quote.std :=
+  nline.no 'nline.std :=
+  cap.no 'cap.std :=
+}
+
+FUNCTION {std.status.using.period}
+{ punct.period 'punct.std :=
+  space.normal 'space.std :=
+  quote.no 'quote.std :=
+  nline.no 'nline.std :=
+  cap.yes 'cap.std :=
+}
+
+FUNCTION {initialize.prev.this.status}
+{ punct.no 'prev.status.punct :=
+  space.no 'prev.status.space :=
+  quote.no 'prev.status.quote :=
+  nline.no 'prev.status.nline :=
+  punct.no 'this.status.punct :=
+  space.no 'this.status.space :=
+  quote.no 'this.status.quote :=
+  nline.no 'this.status.nline :=
+  cap.yes 'status.cap :=
+}
+
+FUNCTION {this.status.std}
+{ punct.std 'this.status.punct :=
+  space.std 'this.status.space :=
+  quote.std 'this.status.quote :=
+  nline.std 'this.status.nline :=
+}
+
+FUNCTION {cap.status.std}{ cap.std 'status.cap := }
+
+FUNCTION {this.to.prev.status}
+{ this.status.punct 'prev.status.punct :=
+  this.status.space 'prev.status.space :=
+  this.status.quote 'prev.status.quote :=
+  this.status.nline 'prev.status.nline :=
+}
+
+
+FUNCTION {not}
+{   { #0 }
+    { #1 }
+  if$
+}
+
+FUNCTION {and}
+{   { skip$ }
+    { pop$ #0 }
+  if$
+}
+
+FUNCTION {or}
+{   { pop$ #1 }
+    { skip$ }
+  if$
+}
+
+
+% convert the strings "yes" or "no" to #1 or #0 respectively
+FUNCTION {yes.no.to.int}
+{ "l" change.case$ duplicate$
+    "yes" =
+    { pop$  #1 }
+    { duplicate$ "no" =
+        { pop$ #0 }
+        { "unknown boolean " quote$ * swap$ * quote$ *
+          " in " * cite$ * warning$
+          #0
+        }
+      if$
+    }
+  if$
+}
+
+
+% pushes true if the single char string on the stack is in the
+% range of "0" to "9"
+FUNCTION {is.num}
+{ chr.to.int$
+  duplicate$ "0" chr.to.int$ < not
+  swap$ "9" chr.to.int$ > not and
+}
+
+% multiplies the integer on the stack by a factor of 10
+FUNCTION {bump.int.mag}
+{ #0 'multiresult :=
+    { duplicate$ #0 > }
+    { #1 -
+      multiresult #10 +
+      'multiresult :=
+    }
+  while$
+pop$
+multiresult
+}
+
+% converts a single character string on the stack to an integer
+FUNCTION {char.to.integer}
+{ duplicate$ 
+  is.num
+    { chr.to.int$ "0" chr.to.int$ - }
+    {"noninteger character " quote$ * swap$ * quote$ *
+          " in integer field of " * cite$ * warning$
+    #0
+    }
+  if$
+}
+
+% converts a string on the stack to an integer
+FUNCTION {string.to.integer}
+{ duplicate$ text.length$ 'namesleft :=
+  #1 'nameptr :=
+  #0 'numnames :=
+    { nameptr namesleft > not }
+    { duplicate$ nameptr #1 substring$
+      char.to.integer numnames bump.int.mag +
+      'numnames :=
+      nameptr #1 +
+      'nameptr :=
+    }
+  while$
+pop$
+numnames
+}
+
+
+
+
+% The output routines write out the *next* to the top (previous) item on the
+% stack, adding punctuation and such as needed. Since IEEEtran.bst maintains
+% the output status for the top two items on the stack, these output
+% routines have to consider the previous output status (which corresponds to
+% the item that is being output). Full independent control of punctuation,
+% closing quote marks, spacing, and newblock is provided.
+% 
+% "output.nonnull" does not check for the presence of a previous empty
+% item.
+% 
+% "output" does check for the presence of a previous empty item and will
+% remove an empty item rather than outputing it.
+% 
+% "output.warn" is like "output", but will issue a warning if it detects
+% an empty item.
+
+FUNCTION {output.nonnull}
+{ swap$
+  prev.status.punct punct.comma =
+     { "," * }
+     { skip$ }
+   if$
+  prev.status.punct punct.period =
+     { add.period$ }
+     { skip$ }
+   if$ 
+  prev.status.quote quote.close =
+     { "''" * }
+     { skip$ }
+   if$
+  prev.status.space space.normal =
+     { " " * }
+     { skip$ }
+   if$
+  prev.status.space space.large =
+     { large.space * }
+     { skip$ }
+   if$
+  write$
+  prev.status.nline nline.newblock =
+     { newline$ "\newblock " write$ }
+     { skip$ }
+   if$
+}
+
+FUNCTION {output}
+{ duplicate$ empty$
+    'pop$
+    'output.nonnull
+  if$
+}
+
+FUNCTION {output.warn}
+{ 't :=
+  duplicate$ empty$
+    { pop$ "empty " t * " in " * cite$ * warning$ }
+    'output.nonnull
+  if$
+}
+
+% "fin.entry" is the output routine that handles the last item of the entry
+% (which will be on the top of the stack when "fin.entry" is called).
+
+FUNCTION {fin.entry}
+{ this.status.punct punct.no =
+     { skip$ }
+     { add.period$ }
+   if$
+   this.status.quote quote.close =
+     { "''" * }
+     { skip$ }
+   if$
+write$
+newline$
+}
+
+
+FUNCTION {is.last.char.not.punct}
+{ duplicate$
+   "}" * add.period$
+   #-1 #1 substring$ "." =
+}
+
+FUNCTION {is.multiple.pages}
+{ '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 {capitalize}{ "u" change.case$ "t" change.case$ }
+
+FUNCTION {emphasize}
+{ duplicate$ empty$
+    { pop$ "" }
+    { "\emph{" swap$ * "}" * }
+  if$
+}
+
+FUNCTION {do.name.latex.cmd}
+{ name.latex.cmd
+  empty$
+    { skip$ }
+    { name.latex.cmd "{" * swap$ * "}" * }
+  if$
+}
+
+% IEEEtran.bst uses its own \BIBforeignlanguage command which directly
+% invokes the TeX hyphenation patterns without the need of the Babel
+% package. Babel does a lot more than switch hyphenation patterns and
+% its loading can cause unintended effects in many class files (such as
+% IEEEtran.cls).
+FUNCTION {select.language}
+{ duplicate$ empty$ 'pop$
+    { language empty$ 'skip$
+        { "\BIBforeignlanguage{" language * "}{" * swap$ * "}" * }
+      if$
+    }
+  if$
+}
+
+FUNCTION {tie.or.space.prefix}
+{ duplicate$ text.length$ #3 <
+    { "~" }
+    { " " }
+  if$
+  swap$
+}
+
+FUNCTION {get.bbl.editor}
+{ editor num.names$ #1 > 'bbl.editors 'bbl.editor if$ }
+
+FUNCTION {space.word}{ " " swap$ * " " * }
+
+
+% Field Conditioners, Converters, Checkers and External Interfaces
+
+FUNCTION {empty.field.to.null.string}
+{ duplicate$ empty$
+    { pop$ "" }
+    { skip$ }
+  if$
+}
+
+FUNCTION {either.or.check}
+{ empty$
+    { pop$ }
+    { "can't use both " swap$ * " fields in " * cite$ * warning$ }
+  if$
+}
+
+FUNCTION {empty.entry.warn}
+{ author empty$ title empty$ howpublished empty$
+  month empty$ year empty$ note empty$ url empty$
+  and and and and and and
+    { "all relevant fields are empty in " cite$ * warning$ }
+    'skip$
+  if$
+}
+
+
+% The bibinfo system provides a way for the electronic parsing/acquisition
+% of a bibliography's contents as is done by ReVTeX. For example, a field
+% could be entered into the bibliography as:
+% \bibinfo{volume}{2}
+% Only the "2" would show up in the document, but the LaTeX \bibinfo command
+% could do additional things with the information. IEEEtran.bst does provide
+% a \bibinfo command via "\providecommand{\bibinfo}[2]{#2}". However, it is
+% currently not used as the bogus bibinfo functions defined here output the
+% entry values directly without the \bibinfo wrapper. The bibinfo functions
+% themselves (and the calls to them) are retained for possible future use.
+% 
+% bibinfo.check avoids acting on missing fields while bibinfo.warn will
+% issue a warning message if a missing field is detected. Prior to calling
+% the bibinfo functions, the user should push the field value and then its
+% name string, in that order.
+
+FUNCTION {bibinfo.check}
+{ swap$ duplicate$ missing$
+    { pop$ pop$ "" }
+    { duplicate$ empty$
+        { swap$ pop$ }
+        { swap$ pop$ }
+      if$
+    }
+  if$
+}
+
+FUNCTION {bibinfo.warn}
+{ swap$ duplicate$ missing$
+    { swap$ "missing " swap$ * " in " * cite$ * warning$ pop$ "" }
+    { duplicate$ empty$
+        { swap$ "empty " swap$ * " in " * cite$ * warning$ }
+        { swap$ pop$ }
+      if$
+    }
+  if$
+}
+
+
+% IEEE separates large numbers with more than 4 digits into groups of
+% three. IEEE uses a small space to separate these number groups. 
+% Typical applications include patent and page numbers.
+
+% number of consecutive digits required to trigger the group separation.
+FUNCTION {large.number.trigger}{ #5 }
+
+% For numbers longer than the trigger, this is the blocksize of the groups.
+% The blocksize must be less than the trigger threshold, and 2 * blocksize
+% must be greater than the trigger threshold (can't do more than one
+% separation on the initial trigger).
+FUNCTION {large.number.blocksize}{ #3 }
+
+% What is actually inserted between the number groups.
+FUNCTION {large.number.separator}{ "\," }
+
+% So as to save on integer variables by reusing existing ones, numnames
+% holds the current number of consecutive digits read and nameptr holds
+% the number that will trigger an inserted space.
+FUNCTION {large.number.separate}
+{ 't :=
+  ""
+  #0 'numnames :=
+  large.number.trigger 'nameptr :=
+  { t empty$ not }
+  { t #-1 #1 substring$ is.num
+      { numnames #1 + 'numnames := }
+      { #0 'numnames := 
+        large.number.trigger 'nameptr :=
+      }
+    if$
+    t #-1 #1 substring$ swap$ *
+    t #-2 global.max$ substring$ 't :=
+    numnames nameptr =
+      { duplicate$ #1 nameptr large.number.blocksize - substring$ swap$
+        nameptr large.number.blocksize - #1 + global.max$ substring$
+        large.number.separator swap$ * *
+        nameptr large.number.blocksize - 'numnames :=
+        large.number.blocksize #1 + 'nameptr :=
+      }
+      { skip$ }
+    if$
+  }
+  while$
+}
+
+% Converts all single dashes "-" to double dashes "--".
+FUNCTION {n.dashify}
+{ large.number.separate
+  '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$
+}
+
+
+% This function detects entries with names that are identical to that of
+% the previous entry and replaces the repeated names with dashes (if the
+% "is.dash.repeated.names" user control is nonzero).
+FUNCTION {name.or.dash}
+{ 's :=
+   oldname empty$
+     { s 'oldname := s }
+     { s oldname =
+         { is.dash.repeated.names
+              { repeated.name.dashes }
+              { s 'oldname := s }
+            if$
+         }
+         { s 'oldname := s }
+       if$
+     }
+   if$
+}
+
+% Converts the number string on the top of the stack to
+% "numerical ordinal form" (e.g., "7" to "7th"). There is
+% no artificial limit to the upper bound of the numbers as the
+% two least significant digits determine the ordinal form.
+FUNCTION {num.to.ordinal}
+{ duplicate$ #-2 #1 substring$ "1" =
+      { bbl.th * }
+      { duplicate$ #-1 #1 substring$ "1" =
+          { bbl.st * }
+          { duplicate$ #-1 #1 substring$ "2" =
+              { bbl.nd * }
+              { duplicate$ #-1 #1 substring$ "3" =
+                  { bbl.rd * }
+                  { bbl.th * }
+                if$
+              }
+            if$
+          }
+        if$
+      }
+    if$
+}
+
+% If the string on the top of the stack begins with a number,
+% (e.g., 11th) then replace the string with the leading number
+% it contains. Otherwise retain the string as-is. s holds the
+% extracted number, t holds the part of the string that remains
+% to be scanned.
+FUNCTION {extract.num}
+{ duplicate$ 't :=
+  "" 's :=
+  { t empty$ not }
+  { t #1 #1 substring$
+    t #2 global.max$ substring$ 't :=
+    duplicate$ is.num
+      { s swap$ * 's := }
+      { pop$ "" 't := }
+    if$
+  }
+  while$
+  s empty$
+    'skip$
+    { pop$ s }
+  if$
+}
+
+% Converts the word number string on the top of the stack to
+% Arabic string form. Will be successful up to "tenth".
+FUNCTION {word.to.num}
+{ duplicate$ "l" change.case$ 's :=
+  s "first" =
+    { pop$ "1" }
+    { skip$ }
+  if$
+  s "second" =
+    { pop$ "2" }
+    { skip$ }
+  if$
+  s "third" =
+    { pop$ "3" }
+    { skip$ }
+  if$
+  s "fourth" =
+    { pop$ "4" }
+    { skip$ }
+  if$
+  s "fifth" =
+    { pop$ "5" }
+    { skip$ }
+  if$
+  s "sixth" =
+    { pop$ "6" }
+    { skip$ }
+  if$
+  s "seventh" =
+    { pop$ "7" }
+    { skip$ }
+  if$
+  s "eighth" =
+    { pop$ "8" }
+    { skip$ }
+  if$
+  s "ninth" =
+    { pop$ "9" }
+    { skip$ }
+  if$
+  s "tenth" =
+    { pop$ "10" }
+    { skip$ }
+  if$
+}
+
+
+% Converts the string on the top of the stack to numerical
+% ordinal (e.g., "11th") form.
+FUNCTION {convert.edition}
+{ duplicate$ empty$ 'skip$
+    { duplicate$ #1 #1 substring$ is.num
+        { extract.num
+          num.to.ordinal
+        }
+        { word.to.num
+          duplicate$ #1 #1 substring$ is.num
+            { num.to.ordinal }
+            { "edition ordinal word " quote$ * edition * quote$ *
+              " may be too high (or improper) for conversion" * " in " * cite$ * warning$
+            }
+          if$
+        }
+      if$
+    }
+  if$
+}
+
+
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% LATEX BIBLIOGRAPHY CODE %%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+% from plainnat.bst
+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" =
+      type$ "periodical" =
+      or
+        { editor.full }
+        { author.full }
+      if$
+    }
+  if$
+}
+% END from plainnat.bst
+
+FUNCTION {start.entry}
+{ newline$
+  "\bibitem[" write$
+  label write$
+  ")" make.full.names duplicate$ short.list =
+     { pop$ }
+     { * }
+   if$
+  "]{" * write$
+  cite$ write$
+  "}" write$
+  newline$
+  ""
+  initialize.prev.this.status
+}
+
+% Here we write out all the LaTeX code that we will need. The most involved
+% code sequences are those that control the alternate interword spacing and
+% foreign language hyphenation patterns. The heavy use of \providecommand
+% gives users a way to override the defaults. Special thanks to Javier Bezos,
+% Johannes Braams, Robin Fairbairns, Heiko Oberdiek, Donald Arseneau and all
+% the other gurus on comp.text.tex for their help and advice on the topic of
+% \selectlanguage, Babel and BibTeX.
+FUNCTION {begin.bib}
+{ "% Generated by IEEEtranSN.bst, version: " bst.file.version * " (" * bst.file.date * ")" *
+  write$ newline$
+  preamble$ empty$ 'skip$
+    { preamble$ write$ newline$ }
+  if$
+  "\begin{thebibliography}{" number.label int.to.str$ * "}" *
+  write$ newline$
+  "\providecommand{\natexlab}[1]{#1}"
+  write$ newline$
+  "\providecommand{\url}[1]{#1}"
+  write$ newline$
+  "\csname url@samestyle\endcsname"
+  write$ newline$
+  "\providecommand{\newblock}{\relax}"
+  write$ newline$
+  "\providecommand{\bibinfo}[2]{#2}"
+  write$ newline$
+  "\providecommand{\BIBentrySTDinterwordspacing}{\spaceskip=0pt\relax}"
+  write$ newline$
+  "\providecommand{\BIBentryALTinterwordstretchfactor}{"
+  ALTinterwordstretchfactor * "}" *
+  write$ newline$
+  "\providecommand{\BIBentryALTinterwordspacing}{\spaceskip=\fontdimen2\font plus "
+  write$ newline$
+  "\BIBentryALTinterwordstretchfactor\fontdimen3\font minus \fontdimen4\font\relax}"
+  write$ newline$
+  "\providecommand{\BIBforeignlanguage}[2]{{%"
+  write$ newline$
+  "\expandafter\ifx\csname l@#1\endcsname\relax"
+  write$ newline$
+  "\typeout{** WARNING: IEEEtranSN.bst: No hyphenation pattern has been}%"
+  write$ newline$
+  "\typeout{** loaded for the language `#1'. Using the pattern for}%"
+  write$ newline$
+  "\typeout{** the default language instead.}%"
+  write$ newline$
+  "\else"
+  write$ newline$
+  "\language=\csname l@#1\endcsname"
+  write$ newline$
+  "\fi"
+  write$ newline$
+  "#2}}"
+  write$ newline$
+  "\providecommand{\BIBdecl}{\relax}"
+  write$ newline$
+  "\BIBdecl"
+  write$ newline$
+}
+
+FUNCTION {end.bib}
+{ newline$ "\end{thebibliography}" write$ newline$ }
+
+FUNCTION {if.url.alt.interword.spacing}
+{ is.use.alt.interword.spacing 
+     {url empty$ 'skip$ {"\BIBentryALTinterwordspacing" write$ newline$} if$}
+     { skip$ }
+   if$
+}
+
+FUNCTION {if.url.std.interword.spacing}
+{ is.use.alt.interword.spacing 
+     {url empty$ 'skip$ {"\BIBentrySTDinterwordspacing" write$ newline$} if$}
+     { skip$ }
+   if$
+}
+
+
+
+
+%%%%%%%%%%%%%%%%%%%%%
+%% FORMAT HANDLERS %%
+%%%%%%%%%%%%%%%%%%%%%
+
+%% Lower Level Formats (used by higher level formats)
+
+FUNCTION {format.address.org.or.pub.date}
+{ 't :=
+  ""
+  year empty$
+    { "empty year in " cite$ * warning$ }
+    { skip$ }
+  if$
+  address empty$ t empty$ and
+  year empty$ and month empty$ and
+    { skip$ }
+    { this.to.prev.status
+      this.status.std
+      cap.status.std
+      address "address" bibinfo.check *
+      t empty$
+        { skip$ }
+        { punct.period 'prev.status.punct :=
+          space.large 'prev.status.space :=
+          address empty$
+            { skip$ }
+            { ": " * }
+          if$
+          t *
+        }
+      if$
+      year empty$ month empty$ and
+        { skip$ }
+        { t empty$ address empty$ and
+            { skip$ }
+            { ", " * }
+          if$
+          month empty$
+            { year empty$
+                { skip$ }
+                { year "year" bibinfo.check * }
+              if$
+            }
+            { month "month" bibinfo.check *
+              year empty$
+                 { skip$ }
+                 { " " * year "year" bibinfo.check * }
+              if$
+            }
+          if$
+        }
+      if$
+    }
+  if$
+}
+
+
+FUNCTION {format.names}
+{ 'bibinfo :=
+  duplicate$ empty$ 'skip$ {
+  this.to.prev.status
+  this.status.std
+  's :=
+  "" 't :=
+  #1 'nameptr :=
+  s num.names$ 'numnames :=
+  numnames 'namesleft :=
+    { namesleft #0 > }
+    { s nameptr
+      name.format.string
+      format.name$
+      bibinfo bibinfo.check
+      't :=
+      nameptr #1 >
+        { nameptr num.names.shown.with.forced.et.al #1 + =
+          numnames max.num.names.before.forced.et.al >
+          is.forced.et.al and and
+            { "others" 't :=
+              #1 'namesleft :=
+            }
+            { skip$ }
+          if$
+          namesleft #1 >
+            { ", " * t do.name.latex.cmd * }
+            { s nameptr "{ll}" format.name$ duplicate$ "others" =
+                { 't := }
+                { pop$ }
+              if$
+              t "others" =
+                { " " * bbl.etal emphasize * }
+                { numnames #2 >
+                    { "," * }
+                    { skip$ }
+                  if$
+                  bbl.and
+                  space.word * t do.name.latex.cmd *
+                }
+              if$
+            }
+          if$
+        }
+        { t do.name.latex.cmd }
+      if$
+      nameptr #1 + 'nameptr :=
+      namesleft #1 - 'namesleft :=
+    }
+  while$
+  cap.status.std
+  } if$
+}
+
+
+
+
+%% Higher Level Formats
+
+%% addresses/locations
+
+FUNCTION {format.address}
+{ address duplicate$ empty$ 'skip$
+    { this.to.prev.status
+      this.status.std
+      cap.status.std
+    }
+  if$
+}
+
+
+
+%% author/editor names
+
+FUNCTION {format.authors}{ author "author" format.names }
+
+FUNCTION {format.editors}
+{ editor "editor" format.names duplicate$ empty$ 'skip$
+    { ", " *
+      get.bbl.editor
+      capitalize
+      *
+    }
+  if$
+}
+
+
+
+%% date
+
+FUNCTION {format.date}
+{
+  month "month" bibinfo.check duplicate$ empty$
+  year  "year" bibinfo.check duplicate$ empty$
+    { swap$ 'skip$
+        { this.to.prev.status
+          this.status.std
+          cap.status.std
+         "there's a month but no year in " cite$ * warning$ }
+      if$
+      *
+    }
+    { this.to.prev.status
+      this.status.std
+      cap.status.std
+      swap$ 'skip$
+        {
+          swap$
+          " " * swap$
+        }
+      if$
+      *
+    }
+  if$
+}
+
+FUNCTION {format.date.electronic}
+{ month "month" bibinfo.check duplicate$ empty$
+  year  "year" bibinfo.check duplicate$ empty$
+    { swap$ 
+        { pop$ }
+        { "there's a month but no year in " cite$ * warning$
+        pop$ ")" * "(" swap$ *
+        this.to.prev.status
+        punct.no 'this.status.punct :=
+        space.normal 'this.status.space :=
+        quote.no 'this.status.quote :=
+        cap.yes  'status.cap :=
+        }
+      if$
+    }
+    { swap$ 
+        { swap$ pop$ ")" * "(" swap$ * }
+        { "(" swap$ * ", " * swap$ * ")" * }
+      if$
+    this.to.prev.status
+    punct.no 'this.status.punct :=
+    space.normal 'this.status.space :=
+    quote.no 'this.status.quote :=
+    cap.yes  'status.cap :=
+    }
+  if$
+}
+
+
+
+%% edition/title
+
+% Note: IEEE considers the edition to be closely associated with
+% the title of a book. So, in IEEEtran.bst the edition is normally handled 
+% within the formatting of the title. The format.edition function is 
+% retained here for possible future use.
+FUNCTION {format.edition}
+{ edition duplicate$ empty$ 'skip$
+    { this.to.prev.status
+      this.status.std
+      convert.edition
+      status.cap
+        { "t" }
+        { "l" }
+      if$ change.case$
+      "edition" bibinfo.check
+      "~" * bbl.edition *
+      cap.status.std
+    }
+  if$
+}
+
+% This is used to format the booktitle of a conference proceedings.
+% Here we use the "intype" field to provide the user a way to 
+% override the word "in" (e.g., with things like "presented at")
+% Use of intype stops the emphasis of the booktitle to indicate that
+% we no longer mean the written conference proceedings, but the
+% conference itself.
+FUNCTION {format.in.booktitle}
+{ booktitle "booktitle" bibinfo.check duplicate$ empty$ 'skip$
+    { this.to.prev.status
+      this.status.std
+      select.language
+      intype missing$
+        { emphasize
+          bbl.in " " *
+        }
+        { intype " " * }
+      if$
+      swap$ *
+      cap.status.std
+    }
+  if$
+}
+
+% This is used to format the booktitle of collection.
+% Here the "intype" field is not supported, but "edition" is.
+FUNCTION {format.in.booktitle.edition}
+{ booktitle "booktitle" bibinfo.check duplicate$ empty$ 'skip$
+    { this.to.prev.status
+      this.status.std
+      select.language
+      emphasize
+      edition empty$ 'skip$
+        { ", " *
+          edition
+          convert.edition
+          "l" change.case$
+          * "~" * bbl.edition *
+        }
+      if$
+      bbl.in " " * swap$ *
+      cap.status.std
+    }
+  if$
+}
+
+FUNCTION {format.article.title}
+{ title duplicate$ empty$ 'skip$
+    { this.to.prev.status
+      this.status.std
+      "t" change.case$
+    }
+  if$
+  "title" bibinfo.check
+  duplicate$ empty$ 'skip$
+    { quote.close 'this.status.quote :=
+      is.last.char.not.punct
+        { punct.std 'this.status.punct := }
+        { punct.no 'this.status.punct := }
+      if$
+      select.language
+      "``" swap$ *
+      cap.status.std
+    }
+  if$
+}
+
+FUNCTION {format.article.title.electronic}
+{ title duplicate$ empty$ 'skip$
+    { this.to.prev.status
+      this.status.std
+      cap.status.std
+      "t" change.case$ 
+    }
+  if$
+  "title" bibinfo.check
+  duplicate$ empty$ 
+    { skip$ } 
+    { select.language }
+  if$
+}
+
+FUNCTION {format.book.title.edition}
+{ title "title" bibinfo.check
+  duplicate$ empty$
+    { "empty title in " cite$ * warning$ }
+    { this.to.prev.status
+      this.status.std
+      select.language
+      emphasize
+      edition empty$ 'skip$
+        { ", " *
+          edition
+          convert.edition
+          status.cap
+            { "t" }
+            { "l" }
+          if$
+          change.case$
+          * "~" * bbl.edition *
+        }
+      if$
+      cap.status.std
+    }
+  if$
+}
+
+FUNCTION {format.book.title}
+{ title "title" bibinfo.check
+  duplicate$ empty$ 'skip$
+    { this.to.prev.status
+      this.status.std
+      cap.status.std
+      select.language
+      emphasize
+    }
+  if$
+}
+
+
+
+%% journal
+
+FUNCTION {format.journal}
+{ journal duplicate$ empty$ 'skip$
+    { this.to.prev.status
+      this.status.std
+      cap.status.std
+      select.language
+      emphasize
+    }
+  if$
+}
+
+
+
+%% how published
+
+FUNCTION {format.howpublished}
+{ howpublished duplicate$ empty$ 'skip$
+    { this.to.prev.status
+      this.status.std
+      cap.status.std
+    }
+  if$
+}
+
+
+
+%% institutions/organization/publishers/school
+
+FUNCTION {format.institution}
+{ institution duplicate$ empty$ 'skip$
+    { this.to.prev.status
+      this.status.std
+      cap.status.std
+    }
+  if$
+}
+
+FUNCTION {format.organization}
+{ organization duplicate$ empty$ 'skip$
+    { this.to.prev.status
+      this.status.std
+      cap.status.std
+    }
+  if$
+}
+
+FUNCTION {format.address.publisher.date}
+{ publisher "publisher" bibinfo.warn format.address.org.or.pub.date }
+
+FUNCTION {format.address.publisher.date.nowarn}
+{ publisher "publisher" bibinfo.check format.address.org.or.pub.date }
+
+FUNCTION {format.address.organization.date}
+{ organization "organization" bibinfo.check format.address.org.or.pub.date }
+
+FUNCTION {format.school}
+{ school duplicate$ empty$ 'skip$
+    { this.to.prev.status
+      this.status.std
+      cap.status.std
+    }
+  if$
+}
+
+
+
+%% volume/number/series/chapter/pages
+
+FUNCTION {format.volume}
+{ volume empty.field.to.null.string
+  duplicate$ empty$ 'skip$
+    { this.to.prev.status
+      this.status.std
+      bbl.volume 
+      status.cap
+        { capitalize }
+        { skip$ }
+      if$
+      swap$ tie.or.space.prefix
+      "volume" bibinfo.check
+      * *
+      cap.status.std
+    }
+  if$
+}
+
+FUNCTION {format.number}
+{ number empty.field.to.null.string
+  duplicate$ empty$ 'skip$
+    { this.to.prev.status
+      this.status.std
+      status.cap
+         { bbl.number capitalize }
+         { bbl.number }
+       if$
+      swap$ tie.or.space.prefix
+      "number" bibinfo.check
+      * *
+      cap.status.std
+    }
+  if$
+}
+
+FUNCTION {format.number.if.use.for.article}
+{ is.use.number.for.article 
+     { format.number }
+     { "" }
+   if$
+}
+
+% IEEE does not seem to tie the series so closely with the volume
+% and number as is done in other bibliography styles. Instead the
+% series is treated somewhat like an extension of the title.
+FUNCTION {format.series}
+{ series empty$ 
+   { "" }
+   { this.to.prev.status
+     this.status.std
+     bbl.series " " *
+     series "series" bibinfo.check *
+     cap.status.std
+   }
+ if$
+}
+
+
+FUNCTION {format.chapter}
+{ chapter empty$
+    { "" }
+    { this.to.prev.status
+      this.status.std
+      type empty$
+        { bbl.chapter }
+        { type "l" change.case$
+          "type" bibinfo.check
+        }
+      if$
+      chapter tie.or.space.prefix
+      "chapter" bibinfo.check
+      * *
+      cap.status.std
+    }
+  if$
+}
+
+
+% The intended use of format.paper is for paper numbers of inproceedings.
+% The paper type can be overridden via the type field.
+% We allow the type to be displayed even if the paper number is absent
+% for things like "postdeadline paper"
+FUNCTION {format.paper}
+{ is.use.paper
+     { paper empty$
+        { type empty$
+            { "" }
+            { this.to.prev.status
+              this.status.std
+              type "type" bibinfo.check
+              cap.status.std
+            }
+          if$
+        }
+        { this.to.prev.status
+          this.status.std
+          type empty$
+            { bbl.paper }
+            { type "type" bibinfo.check }
+          if$
+          " " * paper
+          "paper" bibinfo.check
+          *
+          cap.status.std
+        }
+      if$
+     }
+     { "" } 
+   if$
+}
+
+
+FUNCTION {format.pages}
+{ pages duplicate$ empty$ 'skip$
+    { this.to.prev.status
+      this.status.std
+      duplicate$ is.multiple.pages
+        {
+          bbl.pages swap$
+          n.dashify
+        }
+        {
+          bbl.page swap$
+        }
+      if$
+      tie.or.space.prefix
+      "pages" bibinfo.check
+      * *
+      cap.status.std
+    }
+  if$
+}
+
+
+
+%% technical report number
+
+FUNCTION {format.tech.report.number}
+{ number "number" bibinfo.check
+  this.to.prev.status
+  this.status.std
+  cap.status.std
+  type duplicate$ empty$
+    { pop$ 
+      bbl.techrep
+    }
+    { skip$ }
+  if$
+  "type" bibinfo.check 
+  swap$ duplicate$ empty$
+    { pop$ }
+    { tie.or.space.prefix * * }
+  if$
+}
+
+
+
+%% note
+
+FUNCTION {format.note}
+{ note empty$
+    { "" }
+    { this.to.prev.status
+      this.status.std
+      punct.period 'this.status.punct :=
+      note #1 #1 substring$
+      duplicate$ "{" =
+        { skip$ }
+        { status.cap
+          { "u" }
+          { "l" }
+        if$
+        change.case$
+        }
+      if$
+      note #2 global.max$ substring$ * "note" bibinfo.check
+      cap.yes  'status.cap :=
+    }
+  if$
+}
+
+
+
+%% patent
+
+FUNCTION {format.patent.date}
+{ this.to.prev.status
+  this.status.std
+  year empty$
+    { monthfiled duplicate$ empty$
+        { "monthfiled" bibinfo.check pop$ "" }
+        { "monthfiled" bibinfo.check }
+      if$
+      dayfiled duplicate$ empty$
+        { "dayfiled" bibinfo.check pop$ "" * }
+        { "dayfiled" bibinfo.check 
+          monthfiled empty$ 
+             { "dayfiled without a monthfiled in " cite$ * warning$
+               * 
+             }
+             { " " swap$ * * }
+           if$
+        }
+      if$
+      yearfiled empty$
+        { "no year or yearfiled in " cite$ * warning$ }
+        { yearfiled "yearfiled" bibinfo.check 
+          swap$
+          duplicate$ empty$
+             { pop$ }
+             { ", " * swap$ * }
+           if$
+        }
+      if$
+    }
+    { month duplicate$ empty$
+        { "month" bibinfo.check pop$ "" }
+        { "month" bibinfo.check }
+      if$
+      day duplicate$ empty$
+        { "day" bibinfo.check pop$ "" * }
+        { "day" bibinfo.check 
+          month empty$ 
+             { "day without a month in " cite$ * warning$
+               * 
+             }
+             { " " swap$ * * }
+           if$
+        }
+      if$
+      year "year" bibinfo.check 
+      swap$
+      duplicate$ empty$
+        { pop$ }
+        { ", " * swap$ * }
+      if$
+    }
+  if$
+  cap.status.std
+}
+
+FUNCTION {format.patent.nationality.type.number}
+{ this.to.prev.status
+  this.status.std
+  nationality duplicate$ empty$
+    { "nationality" bibinfo.warn pop$ "" }
+    { "nationality" bibinfo.check
+      duplicate$ "l" change.case$ "united states" =
+        { pop$ bbl.patentUS }
+        { skip$ }
+      if$
+      " " *
+    }
+  if$
+  type empty$
+    { bbl.patent "type" bibinfo.check }
+    { type "type" bibinfo.check }
+  if$  
+  *
+  number duplicate$ empty$
+    { "number" bibinfo.warn pop$ }
+    { "number" bibinfo.check
+      large.number.separate
+      swap$ " " * swap$ *
+    }
+  if$ 
+  cap.status.std
+}
+
+
+
+%% standard
+
+FUNCTION {format.organization.institution.standard.type.number}
+{ this.to.prev.status
+  this.status.std
+  organization duplicate$ empty$
+    { pop$ 
+      institution duplicate$ empty$
+        { "institution" bibinfo.warn }
+        { "institution" bibinfo.warn " " * }
+      if$
+    }
+    { "organization" bibinfo.warn " " * }
+  if$
+  type empty$
+    { bbl.standard "type" bibinfo.check }
+    { type "type" bibinfo.check }
+  if$  
+  *
+  number duplicate$ empty$
+    { "number" bibinfo.check pop$ }
+    { "number" bibinfo.check
+      large.number.separate
+      swap$ " " * swap$ *
+    }
+  if$ 
+  cap.status.std
+}
+
+FUNCTION {format.revision}
+{ revision empty$
+    { "" }
+    { this.to.prev.status
+      this.status.std
+      bbl.revision
+      revision tie.or.space.prefix
+      "revision" bibinfo.check
+      * *
+      cap.status.std
+    }
+  if$
+}
+
+
+%% thesis
+
+FUNCTION {format.master.thesis.type}
+{ this.to.prev.status
+  this.status.std
+  type empty$
+    {
+      bbl.mthesis
+    }
+    { 
+      type "type" bibinfo.check
+    }
+  if$
+cap.status.std
+}
+
+FUNCTION {format.phd.thesis.type}
+{ this.to.prev.status
+  this.status.std
+  type empty$
+    {
+      bbl.phdthesis
+    }
+    { 
+      type "type" bibinfo.check
+    }
+  if$
+cap.status.std
+}
+
+
+
+%% URL
+
+FUNCTION {format.url}
+{ url empty$
+    { "" }
+    { this.to.prev.status
+      this.status.std
+      cap.yes 'status.cap :=
+      name.url.prefix " " *
+      "\url{" * url * "}" *
+      punct.no 'this.status.punct :=
+      punct.period 'prev.status.punct :=
+      space.normal 'this.status.space :=
+      space.normal 'prev.status.space :=
+      quote.no 'this.status.quote :=
+    }
+  if$
+}
+
+
+
+
+%%%%%%%%%%%%%%%%%%%%
+%% ENTRY HANDLERS %%
+%%%%%%%%%%%%%%%%%%%%
+
+
+% Note: In many journals, IEEE (or the authors) tend not to show the number
+% for articles, so the display of the number is controlled here by the
+% switch "is.use.number.for.article"
+FUNCTION {article}
+{ std.status.using.comma
+  start.entry
+  if.url.alt.interword.spacing
+  format.authors "author" output.warn
+  name.or.dash
+  format.article.title "title" output.warn
+  format.journal "journal" bibinfo.check "journal" output.warn
+  format.volume output
+  format.number.if.use.for.article output
+  format.pages output
+  format.date "year" output.warn
+  format.note output
+  format.url output
+  fin.entry
+  if.url.std.interword.spacing
+}
+
+FUNCTION {book}
+{ std.status.using.comma
+  start.entry
+  if.url.alt.interword.spacing
+  author empty$
+    { format.editors "author and editor" output.warn }
+    { format.authors output.nonnull }
+  if$
+  name.or.dash
+  format.book.title.edition output
+  format.series output
+  author empty$
+    { skip$ }
+    { format.editors output }
+  if$
+  format.address.publisher.date output
+  format.volume output
+  format.number output
+  format.note output
+  format.url output
+  fin.entry
+  if.url.std.interword.spacing
+}
+
+FUNCTION {booklet}
+{ std.status.using.comma
+  start.entry
+  if.url.alt.interword.spacing
+  format.authors output
+  name.or.dash
+  format.article.title "title" output.warn
+  format.howpublished "howpublished" bibinfo.check output
+  format.organization "organization" bibinfo.check output
+  format.address "address" bibinfo.check output
+  format.date output
+  format.note output
+  format.url output
+  fin.entry
+  if.url.std.interword.spacing
+}
+
+FUNCTION {electronic}
+{ std.status.using.period
+  start.entry
+  if.url.alt.interword.spacing
+  format.authors output
+  name.or.dash
+  format.date.electronic output
+  format.article.title.electronic output
+  format.howpublished "howpublished" bibinfo.check output
+  format.organization "organization" bibinfo.check output
+  format.address "address" bibinfo.check output
+  format.note output
+  format.url output
+  fin.entry
+  empty.entry.warn
+  if.url.std.interword.spacing
+}
+
+FUNCTION {inbook}
+{ std.status.using.comma
+  start.entry
+  if.url.alt.interword.spacing
+  author empty$
+    { format.editors "author and editor" output.warn }
+    { format.authors output.nonnull }
+  if$
+  name.or.dash
+  format.book.title.edition output
+  format.series output
+  format.address.publisher.date output
+  format.volume output
+  format.number output
+  format.chapter output
+  format.pages output
+  format.note output
+  format.url output
+  fin.entry
+  if.url.std.interword.spacing
+}
+
+FUNCTION {incollection}
+{ std.status.using.comma
+  start.entry
+  if.url.alt.interword.spacing
+  format.authors "author" output.warn
+  name.or.dash
+  format.article.title "title" output.warn
+  format.in.booktitle.edition "booktitle" output.warn
+  format.series output
+  format.editors output
+  format.address.publisher.date.nowarn output
+  format.volume output
+  format.number output
+  format.chapter output
+  format.pages output
+  format.note output
+  format.url output
+  fin.entry
+  if.url.std.interword.spacing
+}
+
+FUNCTION {inproceedings}
+{ std.status.using.comma
+  start.entry
+  if.url.alt.interword.spacing
+  format.authors "author" output.warn
+  name.or.dash
+  format.article.title "title" output.warn
+  format.in.booktitle "booktitle" output.warn
+  format.series output
+  format.editors output
+  format.volume output
+  format.number output
+  publisher empty$
+    { format.address.organization.date output }
+    { format.organization "organization" bibinfo.check output
+      format.address.publisher.date output
+    }
+  if$
+  format.paper output
+  format.pages output
+  format.note output
+  format.url output
+  fin.entry
+  if.url.std.interword.spacing
+}
+
+FUNCTION {manual}
+{ std.status.using.comma
+  start.entry
+  if.url.alt.interword.spacing
+  format.authors output
+  name.or.dash
+  format.book.title.edition "title" output.warn
+  format.howpublished "howpublished" bibinfo.check output 
+  format.organization "organization" bibinfo.check output
+  format.address "address" bibinfo.check output
+  format.date output
+  format.note output
+  format.url output
+  fin.entry
+  if.url.std.interword.spacing
+}
+
+FUNCTION {mastersthesis}
+{ std.status.using.comma
+  start.entry
+  if.url.alt.interword.spacing
+  format.authors "author" output.warn
+  name.or.dash
+  format.article.title "title" output.warn
+  format.master.thesis.type output.nonnull
+  format.school "school" bibinfo.warn output
+  format.address "address" bibinfo.check output
+  format.date "year" output.warn
+  format.note output
+  format.url output
+  fin.entry
+  if.url.std.interword.spacing
+}
+
+FUNCTION {misc}
+{ std.status.using.comma
+  start.entry
+  if.url.alt.interword.spacing
+  format.authors output
+  name.or.dash
+  format.article.title output
+  format.howpublished "howpublished" bibinfo.check output 
+  format.organization "organization" bibinfo.check output
+  format.address "address" bibinfo.check output
+  format.pages output
+  format.date output
+  format.note output
+  format.url output
+  fin.entry
+  empty.entry.warn
+  if.url.std.interword.spacing
+}
+
+FUNCTION {patent}
+{ std.status.using.comma
+  start.entry
+  if.url.alt.interword.spacing
+  format.authors output
+  name.or.dash
+  format.article.title output
+  format.patent.nationality.type.number output
+  format.patent.date output
+  format.note output
+  format.url output
+  fin.entry
+  empty.entry.warn
+  if.url.std.interword.spacing
+}
+
+FUNCTION {periodical}
+{ std.status.using.comma
+  start.entry
+  if.url.alt.interword.spacing
+  format.editors output
+  name.or.dash
+  format.book.title "title" output.warn
+  format.series output
+  format.volume output
+  format.number output
+  format.organization "organization" bibinfo.check output
+  format.date "year" output.warn
+  format.note output
+  format.url output
+  fin.entry
+  if.url.std.interword.spacing
+}
+
+FUNCTION {phdthesis}
+{ std.status.using.comma
+  start.entry
+  if.url.alt.interword.spacing
+  format.authors "author" output.warn
+  name.or.dash
+  format.article.title "title" output.warn
+  format.phd.thesis.type output.nonnull
+  format.school "school" bibinfo.warn output
+  format.address "address" bibinfo.check output
+  format.date "year" output.warn
+  format.note output
+  format.url output
+  fin.entry
+  if.url.std.interword.spacing
+}
+
+FUNCTION {proceedings}
+{ std.status.using.comma
+  start.entry
+  if.url.alt.interword.spacing
+  format.editors output
+  name.or.dash
+  format.book.title "title" output.warn
+  format.series output
+  format.volume output
+  format.number output
+  publisher empty$
+    { format.address.organization.date output }
+    { format.organization "organization" bibinfo.check output
+      format.address.publisher.date output
+    }
+  if$
+  format.note output
+  format.url output
+  fin.entry
+  if.url.std.interword.spacing
+}
+
+FUNCTION {standard}
+{ std.status.using.comma
+  start.entry
+  if.url.alt.interword.spacing
+  format.authors output
+  name.or.dash
+  format.book.title "title" output.warn
+  format.howpublished "howpublished" bibinfo.check output 
+  format.organization.institution.standard.type.number output
+  format.revision output
+  format.date output
+  format.note output
+  format.url output
+  fin.entry
+  if.url.std.interword.spacing
+}
+
+FUNCTION {techreport}
+{ std.status.using.comma
+  start.entry
+  if.url.alt.interword.spacing
+  format.authors "author" output.warn
+  name.or.dash
+  format.article.title "title" output.warn
+  format.howpublished "howpublished" bibinfo.check output 
+  format.institution "institution" bibinfo.warn output
+  format.address "address" bibinfo.check output
+  format.tech.report.number output.nonnull
+  format.date "year" output.warn
+  format.note output
+  format.url output
+  fin.entry
+  if.url.std.interword.spacing
+}
+
+FUNCTION {unpublished}
+{ std.status.using.comma
+  start.entry
+  if.url.alt.interword.spacing
+  format.authors "author" output.warn
+  name.or.dash
+  format.article.title "title" output.warn
+  format.date output
+  format.note "note" output.warn
+  format.url output
+  fin.entry
+  if.url.std.interword.spacing
+}
+
+
+% The special entry type which provides the user interface to the
+% BST controls
+FUNCTION {IEEEtranBSTCTL}
+{ is.print.banners.to.terminal
+    { "** IEEEtran BST control entry " quote$ * cite$ * quote$ * " detected." *
+      top$
+    }
+    { skip$ }
+  if$
+  CTLuse_article_number
+  empty$
+    { skip$ }
+    { CTLuse_article_number
+      yes.no.to.int
+      'is.use.number.for.article :=
+    }
+  if$
+  CTLuse_paper
+  empty$
+    { skip$ }
+    { CTLuse_paper
+      yes.no.to.int
+      'is.use.paper :=
+    }
+  if$
+  CTLuse_forced_etal
+  empty$
+    { skip$ }
+    { CTLuse_forced_etal
+      yes.no.to.int
+      'is.forced.et.al :=
+    }
+  if$
+  CTLmax_names_forced_etal
+  empty$
+    { skip$ }
+    { CTLmax_names_forced_etal
+      string.to.integer
+      'max.num.names.before.forced.et.al :=
+    }
+  if$
+  CTLnames_show_etal
+  empty$
+    { skip$ }
+    { CTLnames_show_etal
+      string.to.integer
+      'num.names.shown.with.forced.et.al :=
+    }
+  if$
+  CTLuse_alt_spacing
+  empty$
+    { skip$ }
+    { CTLuse_alt_spacing
+      yes.no.to.int
+      'is.use.alt.interword.spacing :=
+    }
+  if$
+  CTLalt_stretch_factor
+  empty$
+    { skip$ }
+    { CTLalt_stretch_factor
+      'ALTinterwordstretchfactor :=
+      "\renewcommand{\BIBentryALTinterwordstretchfactor}{"
+      ALTinterwordstretchfactor * "}" *
+      write$ newline$
+    }
+  if$
+  CTLdash_repeated_names
+  empty$
+    { skip$ }
+    { CTLdash_repeated_names
+      yes.no.to.int
+      'is.dash.repeated.names :=
+    }
+  if$
+  CTLname_format_string
+  empty$
+    { skip$ }
+    { CTLname_format_string
+      'name.format.string :=
+    }
+  if$
+  CTLname_latex_cmd
+  empty$
+    { skip$ }
+    { CTLname_latex_cmd
+      'name.latex.cmd :=
+    }
+  if$
+  CTLname_url_prefix
+  missing$
+    { skip$ }
+    { CTLname_url_prefix
+      'name.url.prefix :=
+    }
+  if$
+
+
+  num.names.shown.with.forced.et.al max.num.names.before.forced.et.al >
+    { "CTLnames_show_etal cannot be greater than CTLmax_names_forced_etal in " cite$ * warning$ 
+      max.num.names.before.forced.et.al 'num.names.shown.with.forced.et.al :=
+    }
+    { skip$ }
+  if$
+}
+
+
+%%%%%%%%%%%%%%%%%%%
+%% ENTRY ALIASES %%
+%%%%%%%%%%%%%%%%%%%
+FUNCTION {conference}{inproceedings}
+FUNCTION {online}{electronic}
+FUNCTION {internet}{electronic}
+FUNCTION {webpage}{electronic}
+FUNCTION {www}{electronic}
+FUNCTION {default.type}{misc}
+
+
+
+%%%%%%%%%%%%%%%%%%
+%% MAIN PROGRAM %%
+%%%%%%%%%%%%%%%%%%
+
+READ
+
+EXECUTE {initialize.controls}
+EXECUTE {initialize.status.constants}
+EXECUTE {banner.message}
+
+
+
+% BEGIN sort code based on plainnat.bst
+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 > }
+    {
+      s nameptr "{vv{ } }{ll{ }}{  ff{ }}{  jj{ }}" format.name$ 't :=
+      nameptr #1 >
+        {
+          "   "  *
+          namesleft #1 = t "others" = and
+            { "zzzzz" * }
+            { numnames #2 > nameptr #2 = and
+                { "zz" * 
+                  type$ "patent" =
+                     { year empty$
+                         { yearfiled }
+                         { year }
+                       if$
+                    }
+                    { year }
+                  if$
+                  empty.field.to.null.string * "   " *
+                }
+                { 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 {author.organization.institution.sort}
+{ author empty$
+    { organization empty$
+        { institution empty$
+            { key empty$
+                { "to sort, need author, organization, institution or key in " cite$ * warning$ "" }
+                { key sortify }
+              if$
+            }
+            { "The " #4 institution chop.word sortify }
+          if$
+        }
+        { "The " #4 organization chop.word sortify }
+      if$
+    }
+    { author sort.format.names }
+  if$
+}
+
+
+
+
+STRINGS { last.label next.extra }
+
+INTEGERS { last.extra.num }
+
+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 {author.key.organization.institution.label}
+{ author empty$
+    { key empty$
+        { organization empty$
+            { institution empty$
+              { cite$ #1 #3 substring$ }
+              { "The " #4 institution chop.word #3 text.prefix$ }
+            if$
+            }
+            { "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.label}
+{ type$ "book" =
+  type$ "inbook" =
+  or 
+    { author.editor.key.label }
+    { type$ "proceedings" =
+      type$ "periodical" =
+      or
+        { editor.key.organization.label }
+        { type$ "manual" =
+          type$ "electronic" =
+          type$ "misc" =
+          or or
+            { author.key.organization.label }
+            { type$ "standard" =
+               { author.key.organization.institution.label }
+               { author.key.label }
+             if$ 
+            }
+          if$
+        }
+      if$
+    }
+  if$
+  duplicate$
+  'short.list :=
+  "("
+  *
+  type$ "patent" =
+    { year empty$
+      { yearfiled }
+      { year }
+    if$
+    }
+    { year }
+  if$
+  duplicate$
+  empty$
+  short.list key empty.field.to.null.string = or
+    { pop$ "" }
+    { skip$   }
+  if$
+  *
+  'label :=
+}
+
+
+
+FUNCTION {presort}
+{ type$ "ieeetranbstctl" =
+    { key empty$
+        { "_" }
+        { key sortify }
+      if$
+      duplicate$
+    }
+    { calc.label
+      label sortify
+      "    "
+      *
+      type$ "book" =
+      type$ "inbook" =
+      or 
+        { author.editor.sort }
+        { type$ "proceedings" =
+          type$ "periodical" =
+          or
+            { editor.organization.sort }
+            { type$ "manual" =
+              type$ "electronic" =
+              type$ "misc" =
+              or or
+                { author.organization.sort }
+                { type$ "standard" =
+                   { author.organization.institution.sort }
+                   { author.sort }
+                 if$ 
+                }
+              if$
+            }
+          if$
+        }
+      if$
+      "    "
+      *
+      cite$
+      *
+    }
+  if$
+  #1 entry.max$ substring$
+  'sort.label :=
+  #1 entry.max$ substring$
+  'sort.key$ :=
+}
+
+
+FUNCTION {initialize.longest.label}
+{  "" 'longest.label :=
+  #0 int.to.chr$ 'last.label :=
+  "" 'next.extra :=
+  #0 'longest.label.width :=
+  #0 'last.extra.num :=
+  #0 'number.label :=
+}
+
+FUNCTION {forward.pass}
+{ type$ "ieeetranbstctl" =
+    { skip$ }
+    { 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 :=
+    }
+  if$
+}
+
+FUNCTION {reverse.pass}
+{ type$ "ieeetranbstctl" =
+    { skip$ }
+    {  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 :=
+    }
+  if$
+}
+
+FUNCTION {bib.sort.order}
+{ sort.label  'sort.key$ :=
+}
+% END sort code based on plainnat.bst
+
+
+
+
+ITERATE {presort}
+
+SORT
+
+EXECUTE {initialize.longest.label}
+
+ITERATE {forward.pass}
+REVERSE {reverse.pass}
+
+ITERATE {bib.sort.order}
+
+SORT
+
+EXECUTE {begin.bib}
+ITERATE {call.type$}
+EXECUTE {end.bib}
+
+EXECUTE{completed.message}
+
+
+%% That's all folks, mds.