%% BiBTeX AGU bibliography style  for BiBTeX 0.99a
%% Copyright (C) 1990,1992 Patrick W. Daly, all rights reserved
%%
%%   ====  1990 May 30 =====
%%   ====  1992 November 23 ==== (see list of changes below)
%%   by P. W. Daly, 
%%      Max-Planck_Institut f\"ur Aeronomie,
%%      D-3411 Katlenburg-Lindau,  
%%      F. R. Germany
%%
%%  This is a modification of NATSCI.BST by Stephen Gildea.
%%  Differences are that for the label the author names are italicized and
%%  that the year goes in paratheses after the authors. 
%%  e.g.  \bibitem[{\it Smith and Weston}(1989)]{key}
%%  Citation is to appear either as {\it Smith and Weston} [1989]
%%  or as [{\it Smith and Weston}, 1989] depending on whether
%%  \cite{key} or \cite[]{key} is given. 
%%  The reference appears listed as follows:
%%  Smith, R. G., E. P. Weston, and F. L. Harvey, Title, {\it Journal}, 
%%   {\it 34}, 321--324, 1989. 
%%
%%  Changes to \thebibliography that are necessary to bring this about:
%%
%%\def\thebibliography#1{\section*{\refname
%%  \@mkboth{\refname}{\refname}}\parindent \z@
%%  \immediate\write\@auxout{\begingroup\string\paractive}\list
%% {\arabic{enumiv}.}{\itemsep=0pt \parsep=0pt %default label for NUM styles
%% \usecounter{enumiv}\@bibsetup}%
%% \def\newblock{\hskip .11em plus .33em minus -.07em}%
%% \sloppy
%% \sfcode`\.=1000\relax}
%%
%%\def\endthebibliography{%
%%  \immediate\write\@auxout{\endgroup}%
%%  \def\@noitemerr{\@warning{Empty `thebibliography' environment}}%
%%  \endlist\vskip-\lastskip}
%%
%%\def\@bibsetup#1{\leftmargin=1em\itemindent=-\leftmargin}
%%
%%\def\@citex[#1]#2{\if@filesw\immediate\write\@auxout{\string\citation{#2}}\fi
%%  \def\@citea{}\@cite{\@for\@citeb:=#2\do
%%    {\@citea\def\@citea{\@citesep}\@ifundefined
%%       {b@\@citeb}{{\bf ?}\@warning
%%       {Citation `\@citeb' on page \thepage \space undefined}}%
%%{\csname b@\@citeb\endcsname}}}{#1}}
%%
%%\def\@citesep{; }
%%
%%\def\paractive{\catcode`\(=\active \catcode`\)=\active }
%%
%%{\paractive
%%\gdef\@cite#1#2{{\paractive\if@tempswa[#2\def({,\ }\let)=\relax#1]\else
%%\gdef({\ [}\def){]}#1\fi}}
%%}
%%
%%\def\@biblabel#1{\hfill}
%%
% **********************************************************
% ***** This will not work with BibTeX 0.98 or earlier *****
% **********************************************************
%
%  Changes made 1992 November 23 to comply with AGU 
%  --  extra labels (the `a' in 1992a) in italics 
%  --  `PhD' now written as `Ph.D'
%  --  `Technical Report' is now `technical report' (not capitalized)
%  --  format.date changed so month not written if volume present
%  --  format.pages changed so `p.' and `pp.' not written
%%                                                 -- PWD --
%% BibTeX `natsci' family
%
 
ENTRY
  { address
    author
    booktitle
    chapter
    edition
    editor
    howpublished
    institution
    journal
    key
    month
    note
    number
    organization
    pages
    publisher
    school
    series
    title
    type
    volume
    year
  }
  {}
 
  { label extra.label sort.label }
 
INTEGERS { output.state before.all mid.sentence after.sentence after.block }
 
FUNCTION {init.state.consts}
{ #0 'before.all :=
  #1 'mid.sentence :=
  #2 'after.sentence :=
  #3 'after.block :=
}

STRINGS { s t }

FUNCTION {outputdeuxpoints.nonnull}
{ 's :=
  output.state mid.sentence =
    { ": " * write$ }
    { output.state after.block =
        { ", " * write$
          newline$
          "\newblock " write$
        }
        { output.state before.all =
            'write$
            { add.period$ " " * write$ }
          if$
        }
      if$
      mid.sentence 'output.state :=
    }
  if$
  s
}

FUNCTION {output.nonnull}
{ 's :=
  output.state mid.sentence =
    { ", " * write$ }
    { output.state after.block =
        { ", " * write$
          newline$
          "\newblock " write$
        }
        { output.state before.all =
            'write$
            { add.period$ " " * write$ }
          if$
        }
      if$
      mid.sentence 'output.state :=
    }
  if$
  s
}

FUNCTION {output}
{ duplicate$ empty$
    'pop$
    'output.nonnull
  if$
}

FUNCTION {outputdeuxpoints.check}
{ 't :=
  duplicate$ empty$
    { pop$ "empty " t * " in " * cite$ * warning$ }
    'outputdeuxpoints.nonnull
  if$
}
 
FUNCTION {output.check}
{ 't :=
  duplicate$ empty$
    { pop$ "empty " t * " in " * cite$ * warning$ }
    'output.nonnull
  if$
}
 
FUNCTION {output.bibitem}
{ newline$
 
  "\bibitem[" write$
  label write$
  "]{" write$
 
  cite$ write$
  "}" write$
  newline$
  ""
  before.all 'output.state :=
}
 
FUNCTION {fin.entry}
{ add.period$
  write$
  newline$
}

FUNCTION {new.block}
{ output.state before.all =
    'skip$
    { after.block 'output.state := }
  if$
}

FUNCTION {new.sentence}
{ output.state after.block =
    'skip$
    { output.state before.all =
        'skip$
        { after.sentence 'output.state := }
      if$
    }
  if$
}

FUNCTION {not}
{   { #0 }
    { #1 }
  if$
}

FUNCTION {and}
{   'skip$
    { pop$ #0 }
  if$
}

FUNCTION {or}
{   { pop$ #1 }
    'skip$
  if$
}

FUNCTION {new.block.checka}
{ empty$
    'skip$
    'new.block
  if$
}

FUNCTION {new.block.checkb}
{ empty$
  swap$ empty$
  and
    'skip$
    'new.block
  if$
}

FUNCTION {new.sentence.checka}
{ empty$
    'skip$
    'new.sentence
  if$
}

FUNCTION {new.sentence.checkb}
{ empty$
  swap$ empty$
  and
    'skip$
    'new.sentence
  if$
}

FUNCTION {field.or.null}
{ duplicate$ empty$
    { pop$ "" }
    'skip$
  if$
}

FUNCTION {epaissire}
{ duplicate$ empty$
    { pop$ "" }
    { "{\bf " swap$ * "}" * }
  if$
}

FUNCTION {emphasize}
{ duplicate$ empty$
    { pop$ "" }
    { "{\it " swap$ * "}" * }
  if$
}

INTEGERS { nameptr namesleft numnames }

FUNCTION {format.names}
{ 's :=
  #1 'nameptr :=
  s num.names$ 'numnames :=
  numnames 'namesleft :=
    { namesleft #0 > }
    { s nameptr "{f.~}{vv~}{ll}{, jj}" format.name$ 't :=
      nameptr #1 >
        { namesleft #1 >
            { ", " * t * }
            { numnames #2 >
                { "," * }
                'skip$
              if$
              t "others" =
                { " et~al." * }
                { " and " * t * }
              if$
            }
          if$
        }
        't
      if$
      nameptr #1 + 'nameptr :=
      namesleft #1 - 'namesleft :=
    }
  while$
}

FUNCTION {format.names.reverse1}
{ 's :=
  #1 'nameptr :=
  s num.names$ 'numnames :=
  numnames 'namesleft :=
    { namesleft #0 > }
    {
      nameptr #1 >
        { 
          s nameptr "{f.~}{vv~}{ll}{, jj}" format.name$ 't :=
          namesleft #1 >
            { ", " * t * }
            { t "others" =
                { " et~al." * }
                { ", and " * t * } %AGU wants comma even for two authors!
              if$
            }
          if$
         }
         { s nameptr "{vv~}{ll}{, jj}{, f.}" format.name$ }
      if$
      nameptr #1 + 'nameptr :=
      namesleft #1 - 'namesleft :=
    }
  while$
}

FUNCTION {format.authors}
{ author empty$
    { "" }
    { author format.names.reverse1 }
  if$
}

FUNCTION {format.editors}
{ editor empty$
    { "" }
    { editor format.names
      editor num.names$ #1 >
        { " (Eds.)" * }
        { " (Ed.)" * }
      if$
    }
  if$
}

FUNCTION {format.title}
{ title empty$
    { "" }
    { title "t" change.case$ }
  if$
}

FUNCTION {n.dashify}
{ 't :=
  ""
    { t empty$ not }
    { t #1 #1 substring$ "-" =
        { t #1 #2 substring$ "--" = not
            { "--" *
              t #2 global.max$ substring$ 't :=
            }
            {   { t #1 #1 substring$ "-" = }
                { "-" *
                  t #2 global.max$ substring$ 't :=
                }
              while$
            }
          if$
        }
        { t #1 #1 substring$ *
          t #2 global.max$ substring$ 't :=
        }
      if$
    }
  while$
}

% Month not printed if volume present 
% Extra label (a, b, ...) on date is italicized -- 92 Nov 23 -- PWD
FUNCTION {format.date}
{ year empty$
    { month empty$
        { "" }
        { "there's a month but no year in " cite$ * warning$
          month
        }
      if$
    }
    { month empty$
        'year 
        { volume empty$
            { month " " * year * }
            'year
          if$
        }
      if$
      extra.label emphasize *
    }
  if$
}

FUNCTION {format.btitle}
{ title emphasize
}

FUNCTION {tie.or.space.connect}
{ duplicate$ text.length$ #3 <
    { "~" }
    { " " }
  if$
  swap$ * *
}

FUNCTION {either.or.check}
{ empty$
    'pop$
    { "can't use both " swap$ * " fields in " * cite$ * warning$ }
  if$
}

FUNCTION {format.bvolume}
{ volume empty$
    { "" }
    { "vol." volume tie.or.space.connect
      series empty$
        'skip$
        { " of " * series emphasize * }
      if$
      "volume and number" number either.or.check
    }
  if$
}

FUNCTION {format.number.series}
{ volume empty$
    { number empty$
        { series field.or.null }
        { output.state mid.sentence =
            { "number" }
            { "Number" }
          if$
          number tie.or.space.connect
          series empty$
            { "there's a number but no series in " cite$ * warning$ }
            { " in " * series * }
          if$
        }
      if$
    }
    { "" }
  if$
}

FUNCTION {format.edition}
{ edition empty$
    { "" }
    { output.state mid.sentence =
        { edition "l" change.case$ " edition" * }
        { edition "t" change.case$ " edition" * }
      if$
    }
  if$
}

INTEGERS { multiresult }

FUNCTION {multi.page.check}
{ 't :=
  #0 'multiresult :=
    { multiresult not
      t empty$ not
      and
    }
    { t #1 #1 substring$
      duplicate$ "-" =
      swap$ duplicate$ "," =
      swap$ "+" =
      or or
        { #1 'multiresult := }
        { t #2 global.max$ substring$ 't := }
      if$
    }
  while$
  multiresult
}

% remove the `p.' and `pp.' for pages -- 92 Nov 23 -- PWD
FUNCTION {format.pages}
{ pages empty$
    { "" }
    { pages multi.page.check
        { pages n.dashify }
        { pages }
      if$
    }
  if$
}

FUNCTION {format.vol.num.pages}
{ volume field.or.null 
  epaissire
  pages empty$
    'skip$
    { duplicate$ empty$
        { pop$ format.pages }
        { ", " * pages n.dashify * }
      if$
    }
  if$
}

FUNCTION {format.chapter.pages}
{ chapter empty$
    'format.pages
    { type empty$
        { "chapter" }
        { type "l" change.case$ }
      if$
      chapter tie.or.space.connect
      pages empty$
        'skip$
        { ", " * format.pages * }
      if$
    }
  if$
}

FUNCTION {format.in.ed.booktitle}
{ booktitle empty$
    { "" }
    { "in " booktitle emphasize *
      editor empty$
        'skip$
        { ", " * "edited by " * editor format.names * }
      if$
    }
  if$
}

FUNCTION {format.note}
{ duplicate$ empty$
  'skip$
  { 's :=
    s #1 #1 substring$ 't :=
    output.state mid.sentence =
      { t "l" change.case$ }
      { t "u" change.case$ }
    if$
    s #2 global.max$ substring$ *
  }
if$
}

FUNCTION {empty.misc.check}
{ author empty$ title empty$ howpublished empty$
  month empty$ year empty$ note empty$
  and and and and and
  key empty$ not and
    { "all relevant fields are empty in " cite$ * warning$ }
    'skip$
  if$
}

FUNCTION {format.thesis.type}
{ type empty$
    'skip$
    { pop$
      type "t" change.case$
    }
  if$
}

% write "technical report" noncapitalized -- 92 Nov 23 -- PWD
FUNCTION {format.tr.number}
{ type empty$
    { "technical report" }
    'type
  if$
  number empty$
    { "t" change.case$ }
    { number tie.or.space.connect }
  if$
}

FUNCTION {format.article.crossref}
{ key empty$
    { journal empty$
        { "need key or journal for " cite$ * " to crossref " * crossref *
          warning$
          ""
        }
        { "in {\em " journal * "\/}" * }
      if$
    }
    { "in " key * }
  if$
  " \cite{" * crossref * "}" *
}

FUNCTION {format.book.crossref}
{ volume empty$
    { "empty volume in " cite$ * "'s crossref of " * crossref * warning$
      "in "
    }
    { "vol." volume tie.or.space.connect
      " of " *
    }
  if$
  editor empty$
  editor field.or.null author field.or.null =
  or
    { key empty$
        { series empty$
            { "need editor, key, or series for " cite$ * " to crossref " *
              crossref * warning$
              "" *
            }
            { "{\em " * series * "\/}" * }
          if$
        }
        { key * }
      if$
    }
    'skip$
  if$
  " \cite{" * crossref * "}" *
}

FUNCTION {format.incoll.inproc.crossref}
{ editor empty$
  editor field.or.null author field.or.null =
  or
    { key empty$
        { booktitle empty$
            { "need editor, key, or booktitle for " cite$ * " to crossref " *
              crossref * warning$
              ""
            }
            { "in {\em " booktitle * "\/}" * }
          if$
        }
        { "in " key * }
      if$
    }
    { "in " }
  if$
  " \cite{" * crossref * "}" *
}

FUNCTION {article}
{ output.bibitem
  format.authors "author" output.check
  format.date "year" output.check
  format.title "title" outputdeuxpoints.check
  crossref missing$
    { journal emphasize "journal" output.check
      format.vol.num.pages output
      note format.note output
    }
    { format.article.crossref output.nonnull
      format.pages output
      note format.note output
    }
  if$
  fin.entry
}

FUNCTION {book}
{ output.bibitem
  author empty$
    { format.editors "author and editor" output.check }
    { format.authors output.nonnull
      crossref missing$
        { "author and editor" editor either.or.check }
        'skip$
      if$
    }
  if$
  format.btitle "title" output.check
  crossref missing$
    { format.bvolume output
      format.number.series output
      publisher "publisher" output.check
      address output
    }
    { format.book.crossref output.nonnull }
  if$
  format.edition output
  note format.note output
  format.date "year" output.check
  fin.entry
}

FUNCTION {booklet}
{ output.bibitem
  format.authors output
  format.title "title" output.check
  howpublished output
  address output
  note format.note output
  format.date output
  fin.entry
}

FUNCTION {inbook}
{ output.bibitem
  author empty$
    { format.editors "author and editor" output.check }
    { format.authors output.nonnull
      crossref missing$
        { "author and editor" editor either.or.check }
        'skip$
      if$
    }
  if$
  format.btitle "title" output.check
  crossref missing$
    { format.bvolume output
      format.chapter.pages "chapter and pages" output.check
      format.number.series output
      publisher "publisher" output.check
      address output
    }
    { format.chapter.pages "chapter and pages" output.check
      format.book.crossref output.nonnull
    }
  if$
  format.edition output
  note format.note output
  format.date "year" output.check
  fin.entry
}

FUNCTION {incollection}
{ output.bibitem
  format.authors "author" output.check
  format.title "title" output.check
  crossref missing$
    { format.in.ed.booktitle "booktitle" output.check
      format.bvolume output
      format.number.series output
      format.chapter.pages output
      publisher "publisher" output.check
      address output
      format.edition output
      note format.note output
      format.date "year" output.check
    }
    { format.incoll.inproc.crossref output.nonnull
      format.chapter.pages output
      note format.note output
    }
  if$
  fin.entry
}

FUNCTION {inproceedings}
{ output.bibitem
  format.authors "author" output.check
  format.title "title" output.check
  crossref missing$
    { format.in.ed.booktitle "booktitle" output.check
      format.bvolume output
      format.number.series output
      format.pages output
      address empty$
        { organization output
          publisher output
          note format.note output
          format.date "year" output.check
        }
        { organization output
          publisher output
          address output.nonnull
          note format.note output
          format.date "year" output.check
        }
      if$
    }
    { format.incoll.inproc.crossref output.nonnull
      format.pages output
      note format.note output
    }
  if$
  fin.entry
}

FUNCTION {conference} { inproceedings }

FUNCTION {manual}
{ output.bibitem
  author empty$
    { organization empty$
        'skip$
        { organization output.nonnull
          address output
        }
      if$
    }
    { format.authors output.nonnull }
  if$
  format.btitle "title" output.check
  author empty$
    { organization empty$
        { address output }
        'skip$
      if$
    }
    { organization output
      address output
    }
  if$
  format.edition output
  note format.note output
  format.date output
  fin.entry
}

FUNCTION {mastersthesis}
{ output.bibitem
  format.authors "author" output.check
  format.title "title" output.check
  "Master's thesis" format.thesis.type output.nonnull
  school "school" output.check
  address output
  note format.note output
  format.date "year" output.check
  fin.entry
}

FUNCTION {misc}
{ output.bibitem
  format.authors output
  format.title output
  howpublished output
  note format.note output
  format.date output
  fin.entry
  empty.misc.check
}

% write Ph.D. instead of PhD -- 92 Nov 23 -- PWD
FUNCTION {phdthesis}
{ output.bibitem
  format.authors "author" output.check
  format.btitle "title" output.check
  "Ph.D. thesis" format.thesis.type output.nonnull
  school "school" output.check
  address output
  note format.note output
  format.date "year" output.check
  fin.entry
}

FUNCTION {proceedings}
{ output.bibitem
  editor empty$
    { organization output }
    { format.editors output.nonnull }
  if$
  format.btitle "title" output.check
  format.bvolume output
  format.number.series output
  address empty$
    { editor empty$
        'skip$
        { organization output }
      if$
      publisher output
      note format.note output
      format.date "year" output.check
    }
    { editor empty$
        'skip$
        { organization output }
      if$
      publisher output
      address output.nonnull
      note format.note output
      format.date "year" output.check
    }
  if$
  fin.entry
}

FUNCTION {techreport}
{ output.bibitem
  format.authors "author" output.check
  format.title "title" output.check
  format.tr.number output.nonnull
  institution "institution" output.check
  address output
  note format.note output
  format.date "year" output.check
  fin.entry
}

FUNCTION {unpublished}
{ output.bibitem
  format.authors "author" output.check
  format.title "title" output.check
  note format.note "note" output.check
  format.date output
  fin.entry
}

FUNCTION {default.type} { misc }

MACRO {jan} {"January"}
 
MACRO {feb} {"February"}
 
MACRO {mar} {"March"}
 
MACRO {apr} {"April"}
 
MACRO {may} {"May"}
 
MACRO {jun} {"June"}
 
MACRO {jul} {"July"}
 
MACRO {aug} {"August"}
 
MACRO {sep} {"September"}
 
MACRO {oct} {"October"}
 
MACRO {nov} {"November"}
 
MACRO {dec} {"December"}
 
MACRO {grl} {"Geophys. Res. Lett."}
 
MACRO {jgr} {"J. Geophys. Res."}
 
MACRO {aa} {"Astron. Astrophys."}

MACRO {pass} {"Planet. Space Sci."}

MACRO {adv} {"Adv. Space Res."}

MACRO {ann} {"Annales Geophys."}
 
MACRO {jatp} {"J. Atmos. Terr. Phys."}

READ
 
FUNCTION {sortify}
{ purify$
  "l" change.case$
}

INTEGERS { len }

FUNCTION {chop.word}
{ 's :=
  'len :=
  s #1 len substring$ =
    { s len #1 + global.max$ substring$ }
    's
  if$
}

FUNCTION {format.label.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 {calc.label}
{ author empty$
    { editor empty$
    { key empty$
        { "need a key to make a label in " cite$ * warning$
          title field.or.null purify$ #1 #3 substring$
        }
        { key purify$ #1 #3 substring$ }
      if$
    }
    { editor format.label.names }
      if$
    }
    { author format.label.names }
  if$
%CCC JAS
%  emphasize
  "(" *
  year field.or.null purify$
  *
  ")" *
  'label :=
  label sortify 'sort.label :=
}

FUNCTION {sort.format.names}
{ 's :=
  #1 'nameptr :=
  ""
  s num.names$ 'numnames :=
  numnames 'namesleft :=
    { namesleft #0 > }
    { nameptr #1 >
        { "   " * }
        'skip$
      if$
      s nameptr "{vv{ } }{ll{ }}{  ff{ }}{  jj{ }}" format.name$ 't :=
      nameptr numnames = t "others" = and
        { "et al" * }
        { t sortify * }
      if$
      nameptr #1 + 'nameptr :=
      namesleft #1 - 'namesleft :=
    }
  while$
}

FUNCTION {sort.format.title}
{ 't :=
  "A " #2
    "An " #3
      "The " #4 t chop.word
    chop.word
  chop.word
  sortify
  #1 global.max$ substring$
}

FUNCTION {author.sort}
{ author empty$
    { key empty$
        { "to sort, need author or key in " cite$ * warning$
          ""
        }
        { key sortify }
      if$
    }
    { author sort.format.names }
  if$
}

FUNCTION {author.editor.sort}
{ author empty$
    { editor empty$
        { key empty$
            { "to sort, need author, editor, or key in " cite$ * warning$
              ""
            }
            { key sortify }
          if$
        }
        { editor sort.format.names }
      if$
    }
    { author sort.format.names }
  if$
}

FUNCTION {author.organization.sort}
{ author empty$
    { organization empty$
        { key empty$
            { "to sort, need author, organization, or key in " cite$ * warning$
              ""
            }
            { key sortify }
          if$
        }
        { "The " #4 organization chop.word sortify }
      if$
    }
    { author sort.format.names }
  if$
}

FUNCTION {editor.organization.sort}
{ editor empty$
    { organization empty$
        { key empty$
            { "to sort, need editor, organization, or key in " cite$ * warning$
              ""
            }
            { key sortify }
          if$
        }
        { "The " #4 organization chop.word sortify }
      if$
    }
    { editor sort.format.names }
  if$
}

FUNCTION {presort}
{ calc.label
  sort.label
  "    " *

  type$ "book" =
  type$ "inbook" =
  or
    'author.editor.sort
    { type$ "proceedings" =
        'editor.organization.sort
        { type$ "manual" =
            'author.organization.sort
            'author.sort
          if$
        }
      if$
    }
  if$
  *
  "    "
  *
  year field.or.null sortify
  *
  "    "
  *
  title field.or.null
  sort.format.title
  *
  #1 entry.max$ substring$
  'sort.key$ :=
}

ITERATE {presort}

SORT

STRINGS { last.sort.label next.extra }

INTEGERS { last.extra.num }

FUNCTION {initialize.label}
{ "" 'last.sort.label :=
  "" 'next.extra :=
  #0 'last.extra.num :=
}

FUNCTION {forward.pass}
{ last.sort.label sort.label =
    { last.extra.num #1 + 'last.extra.num :=
      last.extra.num int.to.chr$ 'extra.label :=
    }
    { "a" chr.to.int$ 'last.extra.num :=
      "" 'extra.label :=
      sort.label 'last.sort.label :=
    }
  if$
}
 
% italicize the extra label -- 92 Nov 23 -- PWD
FUNCTION {add.extra.label}
{ duplicate$
  #-1 #1 substring$ ")" =
%    { #-2 global.max$ substring$ extra.label emphasize * ")" * }
%  JAS
     { #-2 global.max$ substring$ extra.label * ")" * }
    { extra.label emphasize * }
  if$
}

FUNCTION {reverse.pass}
{ next.extra "b" =
    { "a" 'extra.label := }
    'skip$
  if$
  label add.extra.label 'label :=
  extra.label 'next.extra :=
}
 
EXECUTE {initialize.label}
 
ITERATE {forward.pass}
 
REVERSE {reverse.pass}
 

FUNCTION {begin.bib}
{ preamble$ empty$
    'skip$
    { preamble$ write$ newline$ }
  if$
  "\begin{thebibliography}{}" write$ newline$
}

EXECUTE {begin.bib}

EXECUTE {init.state.consts}

ITERATE {call.type$}

FUNCTION {end.bib}
{ newline$
  "\end{thebibliography}" write$ newline$
}

EXECUTE {end.bib}