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%^^A* legal notices
% \iffalse
%
%   This program is part of the Frankenstein bundle for LaTeX.  
%
%   Copyright 1995-2001 Matt Swift <swift@alum.mit.edu>.
%
%   This file contains both the code and documentation for the
%   achicago LaTeX package.  It will work ONLY if it is placed in a
%   proper directory.  Files called README, INSTALL, achicago.tex
%   and achicago.ins should have also been distributed to you
%   with this file.  See them for more information on how to typeset
%   the documentation with LaTeX and how to generate a version of this
%   file that will work faster than this one.
%
%   This program is free software; you may redistribute it and/or
%   modify it under the conditions of the LaTeX Project Public
%   License, either version 1.2 or (at your option) any later version.
%   The latest version of this license is in
%   http://www.latex-project.org/lppl.txt, and version 1.2 or later is
%   part of all distributions of LaTeX version 1999/12/01 or later.
%
%   This program is distributed in the hope that it will be useful,
%   but without any warranty; without even the implied warranty of
%   merchantability or fitness for a particular purpose.  See the
%   LaTeX Project Public License for more details.
%
% \fi  
%
%^^A* checks
%
%^^A NOTE:  The character table, with two %'s, will get written to all files.
%% \CharacterTable
%%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
%%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
%%   Digits        \0\1\2\3\4\5\6\7\8\9
%%   Exclamation   \!     Double quote  \"     Hash (number) \#
%%   Dollar        \$     Percent       \%     Ampersand     \&
%%   Acute accent  \'     Left paren    \(     Right paren   \)
%%   Asterisk      \*     Plus          \+     Comma         \,
%%   Minus         \-     Point         \.     Solidus       \/
%%   Colon         \:     Semicolon     \;     Less than     \<
%%   Equals        \=     Greater than  \>     Question mark \?
%%   Commercial at \@     Left bracket  \[     Backslash     \\
%%   Right bracket \]     Circumflex    \^     Underscore    \_
%%   Grave accent  \`     Left brace    \{     Vertical bar  \|
%%   Right brace   \}     Tilde         \~}
%
% \CheckSum{284}
%
%^^A** abstract
% \begin{abstract}
%   \package{Achicago} provides a documentation style for \LaTeX{} that aims
%   for compliance with the \manual.  It uses author-date citations (per
%   ch.~16), but bibliography entries contain unabbreviated information (per
%   ch.~15).  Requires accompanying \BibTeX{} bibliography style,
%   \bst{achicago}.
% \end{abstract}
% \tableofcontents
%
% \part{Discussion}
% \AddToCheckSum{10}^^A FIX no idea why I have to do this.
%
% \section{General}
%
% This package is a companion to the \bst{achicago} \BibTeX{} bibliography
% style.  The set of citation commands offered by \package{achicago} is
% unfortunately shared only with an early implementation of a \manual-compliant
% documentation style, \package{achicago} and \bst{achicago}.  FIX: any others?
% In the future, I hope to make \package{achicago} compatible with the most
% common 
% 
% have to commit to using this bibstyle-package combination when you write your
% sources.  This needn't be true, and one day I am going to create a series of
% mappings from other common bibstyles that are conceptually similar, such as
% the \bst{harvard} styles.  The user commands are slightly different, but it
% should be the case that either set of user commands can be the front end for
% either bibstyle.
%
% Here in this documentation you will read about the commands you will use in
% your \LaTeX{} source file to make citations, and what the citations look
% like.  Documentation of the \bst{achicago} bibstyle itself is in the file
% \file{achicago-bst.dvi}.  There you can read about what the References
% section, the actual book list, looks like.  There are also some new fields
% recognized and other information you might want to know that relates to your
% \BibTeX{} bibliography database file (\ext{bib} file).  You may also wish to
% look at the \package{titles} package (also in the \Frankenstein bundle),
% which can be very helpful in typesetting various styles of titles properly,
% even when nested.  The \package{achicago} package already requires the
% \package{titles} package, so those commands are always there if you want to
% use them.
%
% \caveat{This documentation is sparse but should be accurrate.  I will improve
% it in the future.}
%
% \section{Notes on the future of this package and bibstyle}
%
% \manualref{16.25} permits this combination.
%
% In the future I hope to document more closely \manual's principles wrt each
% entry type, the many choices given by \manual.
% 
% Untested and indeed hardly testable nature of the subject, with all its many
% permutations and difficult special bibliographic cases.  Feedback is very
% welcome, especially with citations from  \manual.
%
% FUTURE One thing I realize now is that I've kept the same user interface I
% inherited, which I don't think corresponds with any other popular style.
% Besides refinement, this is the next major step in the future of this
% bibstyle-package.
%
% \section{Pros and cons of this style}
%
% FIX: terminology: reference style, citation style, bibstyle, bibliography style
%
% When you are required to use a certain reference style, your judgment is not
% called for.  In the cases where it is, here are some considerations.
%
% \begin{description}
%   \item[citations are verbose]

%   Sometimes this information is useful to the reader, sometimes not.  If in
%   most citations it is not useful, consider a style with briefer citations.
%   \item[citation style and quality of writing]
%%
%   FIX cite btxdoc Oren Patashnik argues that ``encourages the passive
%   voice and vague writing.''  I'm not sure.  Even if it's true, an author can
%   surely resist this ``encouragement.''  To encourage is not to require.  Do
%   consider how well \emph{you} write using different citation styles.  If the
%   document is already written, realize that if you change the citation style
%   to one different than the author had in mind while writing, you may make
%   reading it more awkward.  Then again, maybe you will improve it.
%   \item[ease of locating references] 
%
%   The entry for (Benson et~al. 1980) will appear any number of entries
%   \emph{after} the entry for (Benson et~al. 1999) when the former was written
%   by Benson, Zymursky, Wheeler, and Flynn and the latter by Benson (i.e., the
%   same Benson), Floyd, Wheeler, and Flynn, since Zymursky compares greater
%   than Floyd.
%
%   This is an issue to consider if you have a large number of entries with the
%   same initial author (or editor) and often with different sets of 3 or more
%   subsequent authors.  This is, in general, very unlikely.
%
%   The entry for (Gr\"uber 1990b) may not follow the entry for (Gr\"uber
%   1990a) immediately.  When (the same) Gr\"uber has authored 
%   Any number of entries may intervene, but their
%   principals will all be exactly Gr\"uber.  Entries will intervene only in
%   the case when Gr\"uber both authored and edited a work in the same year,
%   and authored one a work with a later date.  
% \end{description}
%
% \section{Usage}
%
% Here are the various citing commands, and examples of the citations they produce.
%
% \todo{What about the situation when you end a sentence with something ending
% with ``et~al.''---in this case you don't want to reproduce the period.}
%
% Distinct examples are \typeset{distinguished this way}.
%
% \begin{tabular}{*{3}{p{.33\textwidth}}}
%  \cs\cite\marg{key}
%    & parenthesized list of up to 3 principals or one ``et~al.'' plus a year label
%    & \typeset{(Brown 1978)} \typeset{(Jarke, Turner, and Stohl 1985)} \\
%  \cs\cite\oarg{spec}\marg{key1}
%    &
%    & \typeset{(Brown 1978, 17)} \typeset{Jarke, Turner, and Stohl 1985, \S 3.3)} \\
%  \cs\cite\marg{key1,key2}
%    &
%    & \typeset{(Brown 1978; Jarke, Turner, and Stohl 1985)} \\
%  \cs\cite\oarg{spec}\marg{key1,key2} FIX: how does this work?
%    &
%    & \typeset{(Brown 1978; Jarke, Turner, and Stohl 1985)} \\
%  \cs\citeNP\meta{key}
%    & as \cs\cite but without enclosing parentheses
%    & \typeset{Brown 1978} \typeset{Jarke, Turner, and Stohl 1985} \\
%  \cs\citeA\marg{key}
%    & as \cs\cite but without year label(s)
%    & \typeset{(Brown)} \typeset{(Jarke, Turner, and Stohl)} \\
%  \cs\citeANP\marg{key}
%    & as \cs\citeA but without enclosing parentheses
%    & \typeset{Brown} \typeset{Jarke, Turner, and Stohl} \\
%  \cs\citeyear\marg{key}
%     & as \cs\cite but without principal list
%     & \typeset{(1978} \typeset{1985} \\
%  \cs\citeyearNP\marg{key}
%    & as \cs\citeyear but without enclosing parentheses
%    & \typeset{1978} \typeset{1985} \\
%  \cs\citeN\marg{key}\footnotemark
%    & principal list and parenthesized year label (i.e., a noun phrase)
%    & FIX: referring to author instead of paper? need good example \\
% \end{tabular}
% \footnotetext{This command should only be used for one key.}
% \todo{Should I use a warning in case more than one key is given to a command
% that shouldn't have them?}
%
%   \subsection{Short citation labels}
%
% Previous versions of \package{achicago} offered a parallel set of citation
% commands with the prefix |short| that created citations with abbreviated
% labels (\cs\shortcite, \cs\shortciteNP, \cs\shortciteA, \cs\shortciteANP,
% \cs\shortciteN).  \package{Achicago} now offers only one kind of label, which
% is abbreviated according to principles in the \manual as much as possible.
% For backwards compatibility, the |short| citation commands still function,
% but they are identical to their non-|short|, and will produce a warning that
% this syntax is deprecated.  Do not use the |short| commands in new documents.
%
% \section{Some technical notes}
%
% \todo{See \manualref{16.14} for issues to do with multiple citations.}
%
% \section{History}
% 
% I wrote this package incorporating \file{chicago\{,a\}.bst} and
% file{chicago.sty} (v4, 92/8).  By now I've almost totally rewritten it.  It
% was a great mess because it had been based on \file{newapa.bst} which had
% been based on several other bibstyles, and each author had really just hacked
% up what was there in the previous bibstyle apparently without fully
% understanding it.  Now, of course, it is a shining example of clarity and
% efficiency.
%
% \StopEventually{}
%
% \part{Implementation}
%
% \section{Version control}
%
%  \begin{macro}{\fileinfo}
%  \begin{macro}{\DoXUsepackagE}
%  \begin{macro}{\HaveECitationS}
%  \begin{macro}{\fileversion}
%  \begin{macro}{\filedate}
%  \begin{macro}{\docdate}
%  \begin{macro}{\PPOptArg}
% These definitions must be the first ones in the file.
%    \begin{macrocode}
\def\fileinfo{Chicago Manual author-date citations}
\def\DoXPackageS {achicago}
\def\initelyHavECitationS {}
\def\fileversion{v1.2}
\def\filedate{2001/08/31}
\def\docdate{2001/08/31}
\edef\PPOptArg {%
  \filedate\space \fileversion\space \fileinfo
}
%    \end{macrocode}
%  \end{macro}
%  \end{macro}
%  \end{macro}
%  \end{macro}
%  \end{macro}
%  \end{macro}
%  \end{macro}
%
% If we're loading this file from a \cs\ProcessDTXFile command (see the
% \package{compsci} package), then \cs\JusTLoaDInformatioN will be defined;
% othewise we assume it is not (that's why the FunkY NamE).
% 
% If we're loading from \cs\ProcessDTXFile, we want to load the packages listed
% in \cs\DoXPackageS (needed to typeset the documentation for this file) and
% then bail out.  Otherwise, we're using this file in a normal way as a
% package, so do nothing.  \cs\DoXPackageS, if there are any, are declared in
% the \ext{dtx} file, and, if you're reading the typeset documentation of this
% package, would appear just above.  (It's OK to call \cs\usepackage with an
% empty argument or \cs\relax, by the way.)
%    \begin{macrocode}
\makeatletter% A special comment to help create bst files.  Don't change!
\@ifundefined{JusTLoaDInformatioN} {%
  }{% ELSE (we know the compsci package is already loaded, too)
  \UndefineCS\JusTLoaDInformatioN
  \SaveDoXVarS
  \eExpand\csname DoXPackageS\endcsname\In {%use \csname in case it's undefined
    \usepackage{#1}%
  }%
  \RestoreDoXVarS
  \makeatother
  \endinput
}% A special comment to help create bst files.  Don't change!
%    \end{macrocode}
%
% Now we check for \LaTeX2e and declare the LaTeX package.
%    \begin{macrocode}
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{achicago}[\PPOptArg]
%    \end{macrocode}^^A special comment to help create bst files.  Don't change!
%
% ^^A NOTE: We have to compensate for the above backslashes, which are not
% ^^A       actually in the .dtx file the author works on, by adding to the
% ^^A       CheckSum.
%%
% \AddToCheckSum{17}^^A `dtx-update-checksum' automatically handles this.
% \AddToCheckSum{7}^^A The half a macrocode env. at the top is missed, however...
% \AddToCheckSum{10}^^A ... and so are the 5 \defs from the .dtx file 
%                   ^^A     that precede it.
% \IfCitations {%
%   \AddToCheckSum{2}^^A When \initelyHavECitationS is defined in
% }                  ^^A the .dtx file, we need 2 more in the CheckSum.
%
%
%    \begin{macrocode}
\RequirePackage{blkcntrl,moredefs,slemph,titles,verbatim}
%    \end{macrocode}
%
%    \begin{macrocode}
\newboolean{Annotate}
\newcommand\annotate {%
  \Annotatetrue
}
\newcommand\noannotate {%
  \Annotatefalse
}
%    \end{macrocode}
%
% \cs\citework is supposed to be a general command for citing things declared
% with \cs\newwork in the \package{abbrevs} package.  It has one optional and
% one required argument so that it is parallel with the other citing commands,
% but I cannot see any use for it without the optional argument.  Environments
% can exert complete control over how this macro looks by resetting the three
% parameters.  The default will look good outside all environments, in running
% text.
%
% The second argument is expected to be something defined with \cs\newwork.  
% 
% Needs modification to handle the empty optional arg.  Watch interfering with
% things surrounding macros might have set. \cs\relax's are intentionally left
% out to let constructions like \cs\csname\lips\cs\endcsname [eh? FIX] work on
% the arguments.
%
% \begin{macro}{\PreCiteWork}
% \begin{macro}{\PostCiteWork}
%   \begin{macrocode}
\providesavebox\sc@box@a
\newcommand\PreCiteWork {%
  (\csname%
}
\newcommand\PostCiteWork {%
  \end{lrbox}\usebox{\sc@box@a})%
}
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% We don't want to be unbreakable here, but we want a high penalty.  We
% absolutely do not want to break the number range, so we put it in an lrbox.
%
% I think comma is better, even though it might seem fussy, because it is
% better parallel with the way \cs\cite works with an optional page argument:  the
% convention is that page numbers come after commas.
%
%    \begin{macrocode}
\newcommand\MidCiteWork {%
  \endcsname,\penalty9000\ \begin{lrbox}{\sc@box@a}%
}
\newcommand\citework [2] {%
  \PreCiteWork #2\MidCiteWork #1\PostCiteWork
}
%    \end{macrocode}
%
% \begin{verbatim}
% The {} fools abbrevs.dtx into not adding an extra space
% \newcommand\MidCiteWork {%
%   \endcsname{}\penalty9000\ \begin{lrbox}{\sc@box@a}%
% }
% \end{verbatim}
%
% \todo{Make citework* with no parentheses, or other alternative.}
%
% FIX:  When the ? is placed there, there are two left parens, one right.
%
% We want the remaining macros in this section to be available in their own
% piece. 
%
% \todo{is \cs\PreChunk the only dependence on blkcntrl?  Should make this not
% necessary if so.}
%
%    \begin{macrocode}
\newcommand\PreAnnotation {%
  \PreChunk
}
%    \end{macrocode}
%
% This will make the definition of the \env{thebibliography} environment in
% \file{classes.dtx} do the right thing.  FIX: not defined in letter class?
%    \begin{macrocode}
\defcommand\@openbib@code {%
  \advance\leftmargin\bibindent
  \itemindent -\bibindent
  \listparindent \itemindent
  \parsep \z@
}
\let\newblock\relax
%    \end{macrocode}
% This doesn't work at the beginning, for some reason.   The auxfiles are not
% set up right?  URK: don't do this.  Confuses users and also prevents anyone
% from using achicago.sty with another bibstyle, such as a modified achicago.bst.
% Is there a way I can provide a useful warning message for those who might
% have been using this before, without a \cs\bibliographystyle
%    \begin{macrocode}
%\AtEndDocument {%
%  \bibliographystyle{achicago}%
%}  
%    \end{macrocode}
%
% The \bst{achicago} bibliography style will insert some macros that are not
% defined by \LaTeX, and some that must have new meanings.  They are:
% \cs\citeN, \cs\SCcite, \cs\SCduplicate, \code{\begin{SCannotation}},
% \code{\end{SCannotation}}.
%
% Some of these commands should properly have |@| in their names, but
% |@|-commands cannot appear in the \ext{bbl} file.  As a compromise, the names
% have the prefix |SC|.
%
%  \begin{macro}{\SCduplicate}
%  \begin{macro}{\ac@mmmdash}
% The argument will contain the `label' that is a duplicate, in case it might
% ever be of use.  But for now, we just want to replace duplicates with 3-em
% dashes.
%
% \todo{provide option to spell out the duplicate when it is the first entry on
% a page (oneside) or verso page (twosided)}
%
% A 3em-dash.
%    \begin{macrocode}
\newcommand\ac@mmmdash {%
  \rule[.6ex]{3em}{.03ex}%
}
\newcommand*\SCduplicate [1] {%
  \ac@mmmdash
}
%    \end{macrocode}
%  \end{macro}
%  \end{macro}
%
% \begin{macro}{\PreAnnotation}
% \begin{macro}{\ac@begingobble}
% \begin{macro}{\ac@endgobble}
% \begin{environment}{SCannotation}
% This sets up the \env{SCannotation} environment.  When the boolean
% \cs\IfAnnotate is false, we gobble everything between \code{\begin{SCannotation}}
% and \code{\end{SCannotation}}.
%
% We require the \package{verbatim} package to do this.  I used to put the text
% into an |lrbox| and just never use the box.  This required balanced text
% inside (not a bad thing), but it also would process any \cs\cite-like
% commands that appeared in the gobbled text, which could lead to perpetual
% warnings about unresolved references.  There were in fact no unresolved
% references, but the warnings were annoying.
%    \begin{macrocode}
\newlet\ac@begingobble\comment
\newlet\ac@endgobble\endcomment
%    \end{macrocode}
% \todo{I shouldn't define annote in terms of quotation, we should copy a
% standard one here; What is the point of the \cs\relax?  I ended up removing
% them before the \cname{ac@begingobble} cases because I had to use the
% \cs\expandafter.}
% 
%    \begin{macrocode}
\newenvironment{SCannotation} {%
    \ifAnnotate
      \let\PreQuotation\PreAnnotation
      \relax\quotation
    \else
      \expandafter\ac@begingobble
    \fi
  }{%
  \ifAnnotate
    \relax\endquotation
  \else
    \expandafter\ac@endgobble
  \fi
}
%    \end{macrocode}
%  \end{environment}
% \end{macro}
% \end{macro}
% \end{macro}
%
%  \begin{macro}{\SCcite}
%  \begin{macro}{\ac@firstoftwo}
% \cs\SCcite is what \bst{achicago} produces.  Its args are `label',
% and `year.label'. FIX: aak, plus tag.
%    \begin{macrocode}
\ReserveCS\SCcite
\newlet\UnexpandableProtect\@unexpandable@protect

\newcommand*\ac@firstoftwo [2] {#1}
\newcommand*\ac@secondoftwo [2] {#2}
\newcommand*\ac@onespacetwo [2] {#1\ #2}
\newcommand*\ac@onespacepretwo [2] {#1\ \PreCite #2}

\newcommand*\ac@cite@preonecommatwopost [2] {%
  \PreCite #1\if@tempswa , #2\fi\PostCite
}
\newcommand*\ac@cite@onecommatwo [2] {%
  #1\if@tempswa , #2\fi
}
\newcommand*\ac@cite@onecommatwopost [2] {%
  #1\if@tempswa , #2\fi \PostCite
}

%    \end{macrocode}
%  \end{macro}
%  \end{macro}
%
%  \begin{macro}{\PreCite}
%  \begin{macro}{\PostCite}
%    \mbox{}
%    \begin{macrocode}
\newlet\PreCite  (
\newlet\PostCite )
%    \end{macrocode}
%  \end{macro}
%  \end{macro}
%
% \begin{macro}{\cite}
% \begin{macro}{\citeNP}
% \begin{macro}{\citeA}
% \begin{macro}{\citeN}
% \begin{macro}{\citeANP}
% The way this works is: \cname{\@cite} is called once for each citing command,
% and \cs\SCcite is called once for each key.  The results are spaced by either
% semicolons (\cname{\ac@cite@sc}) or commas (\cname{\ac@cite@comma}), and
% these become argument |#1| for \cname{\@cite}.
%    \begin{macrocode}
\def\cite {%
  \let\@cite\ac@cite@preonecommatwopost
  \let\SCcite\ac@onespacetwo
  \ac@cite@sc
}
\newcommand*\citeNP {%
  \let\@cite\ac@cite@onecommatwo
  \let\SCcite\ac@onespacetwo
  \ac@cite@sc
}
\newcommand*\citeN {%
  \let\@cite\ac@cite@onecommatwopost
  \let\SCcite\ac@onespacepretwo
  \ac@cite@comma
}
\newcommand*\citeA {%
  \let\@cite\ac@cite@preonecommatwopost
  \let\SCcite\ac@firstoftwo
  \ac@cite@sc
}
\newcommand*\citeANP {%
  \let\@cite\ac@cite@onecommatwo
  \let\SCcite\ac@firstoftwo
  \ac@cite@sc
}
%    \end{macrocode}
%  \end{macro}
%  \end{macro}
%  \end{macro}
%  \end{macro}
%  \end{macro}
%    
%  \begin{macro}{\shortcite}
%  \begin{macro}{\shortciteNP}
%  \begin{macro}{\shortciteN}
%  \begin{macro}{\shortciteA}
%  \begin{macro}{\shortciteANP}
%    \begin{macrocode}
\newlet\shortcite\cite
\newlet\shortciteNP\citeNP
\newlet\shortciteN\citeN
\newlet\shortciteA\citeA
\newlet\shortciteANP\citeANP
%    \end{macrocode}
%  \end{macro}
%  \end{macro}
%  \end{macro}
%  \end{macro}
%  \end{macro}
%
%  \begin{macro}{\citeyear}
%  \begin{macro}{\citeyearNP}
% \mbox{}
%    \begin{macrocode}
\newcommand*\citeyear {%
  \let\@cite\ac@cite@preonecommatwopost
  \let\SCcite\ac@secondoftwo
  \ac@cite@comma
}
\newcommand*\citeyearNP {%
  \let\@cite\ac@cite@onecommatwo
  \let\SCcite\ac@secondoftwo
  \ac@cite@comma
}
%    \end{macrocode}
%  \end{macro}
%  \end{macro}
%
%  \begin{macro}{\ac@citesep}
%  \begin{macro}{\ac@cite@sc}
%  \begin{macro}{\ac@cite@comma}
% \mbox{}
%    \begin{macrocode}
\ReserveCS\ac@citesep
\newcommand\ac@cite@sc {%
  \let\ac@citesep ;%
  \ac@cite
}
\newcommand*\ac@cite@comma {%
  \let\ac@citesep ,%
  \ac@cite
}
%    \end{macrocode}
%  \end{macro}
%  \end{macro}
%  \end{macro}
%
%  \begin{macro}{\ac@cite}
% This command executes \cname{\b@foo} for every \cs\foo in the list of cited
% labels, and separates them by arg |#1|.
%
% There has got to be a more elegant solution to this whole thing. FIX
%    \begin{macrocode}
\newcommand*\ac@cite {%
  \@ifnextchar [ {%
      \@tempswatrue
      \ac@@cite
    }{% ELSE
    \@tempswafalse
    \ac@@cite[]%
  }%
}
%    \end{macrocode}
%  \todo{handle reserving names}
%    \begin{macrocode}
\providecommand\@writeaux {%
  \immediate\write\@auxout
}
\NewName*{ac@@cite} {[#1]#2} {% args: [optarg] label % optarg MANDATORY
  \if@filesw
    \@writeaux{\string\citation{#2}}%
  \fi
  \@cite{%
    \InitCS\sc@t@a
    \@for\ac@label:=#2\do {%
      \sc@t@a
%      \let\sc@t@a\ac@citesep
      \def\sc@t@a {\ac@citesep\ }% add space
      \@ifundefined{b@\ac@label} {%
          {\bfseries ?}%
          \@warning{Citation `\ac@label' on page \thepage\space undefined}%
        }{% ELSE
        \@nameuse{b@\ac@label}%
      }%
    }%
  }{#1}%
}
%    \end{macrocode}
%  \end{macro}
%
%  \begin{macro}{\bibindent}
% Indent second and subsequent lines of bibliographic entries.
%    \begin{macrocode}
\setlength\bibindent{1.5em}
%    \end{macrocode}
%  \end{macro}
%
%  \begin{environment}{thebibliography}
% There is no \option{openbib} option.  The definitions of \cs\newblock and
% \cname{@biblabel} are kept local in case something else weird is going on.
%    \begin{macrocode}
\newcommand\ac@defbib [2] {%
  \renewenvironment*{thebibliography} [1] {%
      #1*{#2\@mkboth{#2}{#2}}%
      \list{}{%
                          \leftmargin\z@
                          \advance\leftmargin\labelsep
                          \advance\leftmargin\bibindent
                          \itemindent -\bibindent
                          \listparindent \itemindent
                          \parsep \z@}%
%    \end{macrocode}
% \manual does not acknowledge different spacings after different marks of
% punctuation, distinguish interword from intersentence space, or give rules
% about where to break a line near an ellipsis.  So we are on our own in the
% bibliography.  I have chosen to leave things as they are done in the standard
% bibliography styles, because I haven't yet given it my close consideration.
% That is, we leave all the punctuation the same except for the period, which
% we set to~1000, I forget now whether that's a lower or upper case letter.
% Extending the space after a period when appropriate seems to be the purpose
% of using \cs\newblock, in this bibstyle.
%    \begin{macrocode}
      \sfcode`\.=\@m
      \def\newblock {%
        \hskip .11em \@plus.33em \@minus.07em%
      }%
      \let\@biblabel\Gobble
      \sloppy
      \clubpenalty4000\widowpenalty4000%
    }{%
    \def\@noitemerr {%
      \@latex@warning{Empty `thebibliography' environment}%
    }%
    \relax\endlist
  }%
}
\@ifclassloaded{article} {%
    \ac@defbib{\section}{\refname}%
  }{% ELSE
  \ac@defbib{\chapter}{\bibname}%
}
\InitCS\ac@defbib  % FIX -- where else can I do this?
%    \end{macrocode}
%  \end{environment}
%
% \Finale