MirBSD manpage: 26.refer(USD)

Refer - A Bibliography System                            USD:26-1

                  Refer - A Bibliography System

                          Bill Tuthill

                       Computing Services
                    University of California
                       Berkeley, CA 94720


          Refer is a bibliography system that supports  data
     entry, indexing, retrieval, sorting, runoff, convenient
     citations, and  footnote  or  endnote  numbering.  This
     document  assumes you know how to use some Unix editor,
     and that you are familiar  with  the  nroff/troff  text

          The  refer   program   is   a   preprocessor   for
     nroff/troff,  like  eqn and tbl, except that it is used
     for literature citations, rather than for equations and
     tables. Given incomplete but sufficiently precise cita-
     tions, refer finds references in a bibliographic  data-
     base.  The  complete  references are formatted as foot-
     notes, numbered, and placed either at the bottom of the
     page, or at the end of a chapter.

          A number of ancillary programs make  refer  easier
     to  use. The addbib program is for creating and extend-
     ing  the  bibliographic  database;  sortbib  sorts  the
     bibliography by author and date, or other selected cri-
     teria; and roffbib runs off the entire  database,  for-
     matting  it  not as footnotes, but as a bibliography or
     annotated bibliography.

          Once a full bibliography has been created,  access
     time  can  be improved by making an index to the refer-
     ences with indxbib. Then, the lookbib  program  can  be
     used to quickly retrieve individual citations or groups
     of citations. Creating this inverted index  will  speed
     up  refer,  and lookbib will allow you to verify that a
     citation is sufficiently precise to  deliver  just  one


     Taken together, the refer  programs  constitute  a  database
system  for  use with variable-length information. To distinguish

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various types of bibliographic material, the system  uses  labels
composed  of  upper  case letters, preceded by a percent sign and
followed by a space. For example, one  document  might  be  given
this entry:

        %A      Joel Kies
        %T      Document Formatting on Unix Using the -ms Macros
        %I      Computing Services
        %C      Berkeley
        %D      1980

Each line is called a  field,  and  lines  grouped  together  are
called a record; records are separated from each other by a blank
line. Bibliographic information follows  the  labels,  containing
data  to  be used by the refer system. The order of fields is not
important, except that authors should  be  entered  in  the  same
order  as  they are listed on the document. Fields can be as long
as necessary, and may even be continued on the following line(s).

     The labels are meaningful to nroff/troff macros, and, with a
few  exceptions,  the refer program itself does not pay attention
to them. This implies that you can change the label codes, if you
also  change  the  macros  used by nroff/troff. The macro package
takes care of details like proper ordering, underlining the  book
title  or journal name, and quoting the article's title. Here are
the labels used  by  refer,  with  an  indication  of  what  they

        %H      Header commentary, printed before reference
        %A      Author's name
        %Q      Corporate or foreign author (unreversed)
        %T      Title of article or book
        %S      Series title
        %J      Journal containing article
        %B      Book containing article
        %R      Report, paper, or thesis (for unpublished material)
        %V      Volume
        %N      Number within volume
        %E      Editor of book containing article
        %P      Page number(s)
        %I      Issuer (publisher)
        %C      City where published
        %D      Date of publication
        %O      Other commentary, printed at end of reference
        %K      Keywords used to locate reference
        %L      Label used by -k option of refer
        %X      Abstract (used by roffbib, not by refer)

Only relevant fields should be  supplied.  Except  for  %A,  each
field should be given only once; in the case of multiple authors,
the senior author should come first. The %Q is for organizational
authors, or authors with Japanese or Arabic names, in which cases
the order of names should be preserved. Books should  be  labeled
with  the  %T,  not  with  the  %B,  which  is reserved for books

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containing articles. The %J and %B  fields  should  never  appear
together,  although  if  they do, the %J will override the %B. If
there is no author, just an editor, it is best to type the editor
in the %A field, as in this example:

        %A      Bertrand Bronson, ed.

The %E field is used for the editor of a book (%B) containing  an
article,  which has its own author. For unpublished material such
as theses, use the %R field; the title in the %T  field  will  be
quoted,  but the contents of the %R field will not be underlined.
Unlike other fields, %H, %O, and  %X  should  contain  their  own
punctuation. Here is a modest example:

        %A      Mike E. Lesk
        %T      Some Applications of Inverted Indexes on the Unix System
        %B      Unix Programmer's Manual
        %I      Bell Laboratories
        %C      Murray Hill, NJ
        %D      1978
        %V      2a
        %K      refer mkey inv hunt
        %X      Difficult to read paper that dwells on indexing strategies,
        giving little practical advice about using \fBrefer\fP.

Note that the author's name is given  in  normal  order,  without
inverting  the  surname;  inversion is done automatically, except
when %Q is used instead of %A. We use %X rather than %O  for  the
commentary  because  we  do  not want the comment printed all the
time. The %O and %H fields are printed by both refer and roffbib;
the %X field is printed only by roffbib, as a detached annotation

Data Entry with Addbib

     The addbib program is for  creating  and  extending  biblio-
graphic databases. You must give it the filename of your bibliog-

        % addbib  database

Every time you enter addbib, it asks if you want instructions. To
get  them,  type y; to skip them, type RETURN. Addbib prompts for
various fields, reads from the keyboard, and writes records  con-
taining  the refer codes to the database. After finishing a field
entry, you should end it by typing RETURN. If a field is too long
to  fit  on  a line, type a backslash (\) at the end of the line,
and you will be able to continue on the following line. Note: the
backslash works in this capacity only inside addbib.

     A field will not be written to the database  if  nothing  is
entered  into  it.  Typing a minus sign as the first character of
any field will cause addbib to back up one field at a time. Back-
ing  up  is  the  best way to add multiple authors, and it really

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helps if you forget to add something important. Fields  not  con-
tained  in  the  prompting  skeleton  may  be entered by typing a
backslash as the last character before RETURN. The following line
will be sent verbatim to the database and addbib will resume with
the next field. This is identical to the  procedure  for  dealing
with  long  fields,  but with new fields, don't forget the % key-

     Finally, you will be asked for an abstract (or  annotation),
which will be preserved as the %X field. Type in as many lines as
you need, and end with a control-D (hold down  the  CTRL  button,
then  press  the  "d" key). This prompting for an abstract can be
suppressed with the -a command line option.

     After one bibliographic record has  been  completed,  addbib
will  ask  if  you  want  to continue. If you do, type RETURN; to
quit, type q or n (quit or no). It is also possible to use one of
the  system editors to correct mistakes made while entering data.
After the "Continue?" prompt, type any of  the  following:  edit,
ex, vi, or ed -- you will be placed inside the corresponding edi-
tor, and returned to addbib afterwards, from where you can either
quit or add more data.

     If the prompts normally supplied by addbib are  not  enough,
are in the wrong order, or are too numerous, you can redefine the
skeleton by constructing a promptfile. Create some  file,  to  be
named  after  the  -p  command line option. Place the prompts you
want on the left side, followed by a single TAB (control-I), then
the  refer  code that is to appear in the bibliographic database.
Addbib will send the left side to the screen, and the right side,
along with data entered, to the database.

Printing the Bibliography

     Sortbib is for sorting the bibliography by author  (%A)  and
date  (%D),  or  by  data in other fields. It is quite useful for
producing bibliographies and annotated bibliographies, which  are
seldom  entered  in  strict alphabetical order. It takes as argu-
ments the names of up to 16 bibliography  files,  and  sends  the
sorted  records  to  standard output (the terminal screen), which
may be redirected through a pipe or into a file.

     The -sKEYS flag to sortbib will sort by  fields  whose  key-
letters  are in the KEYS string, rather than merely by author and
date. Key-letters in KEYS may be followed by a  `+'  to  indicate
that  all  such  fields are to be used. The default is to sort by
senior author and date (printing  the  senior  author  last  name
first),  but  -sA+D  will  sort by all authors and then date, and
-sATD will sort on senior author, then title, and then date.

     Roffbib is for running off the (probably sorted)  bibliogra-
phy.  It  can  handle annotated bibliographies -- annotations are
entered in the %X (abstract) field. Roffbib  is  a  shell  script
that   calls   refer -B   and  nroff -mbib.  It  uses  the  macro

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definitions that reside in /usr/lib/tmac/tmac.bib, which you  can
redefine  if you know nroff and troff. Note that refer will print
the %H and %O commentaries, but will ignore abstracts in  the  %X
field;  roffbib  will  print  both fields, unless annotations are
suppressed with the -x option.

     The following command sequence  will  lineprint  the  entire
bibliography, organized alphabetically by author and date:

        % sortbib  database  |  roffbib  |  lpr

This is a good way to proofread the bibliography, or to produce a
stand-alone  bibliography  at  the  end of a paper. Incidentally,
roffbib accepts all flags used with nroff. For example:

        % sortbib  database  |  roffbib  -Tdtc  -s1

will make accent marks work on a  DTC  daisy-wheel  printer,  and
stop  at  the bottom of every page for changing paper. The -n and
-o flags may also be quite useful, to start page numbering  at  a
selected point, or to produce only specific pages.

     Roffbib  understands  four  command-line  number  registers,
which  are something like the two-letter number registers in -ms.
The -rN1 argument will number references beginning  at  one  (1);
use  another number to start somewhere besides one. The -rV2 flag
will  double-space  the  entire  bibliography,  while  -rV1  will
double-space  the  references,  but  single-space  the annotation
paragraphs. Finally, specifying -rL6i  changes  the  line  length
from  6.5  inches  to  6  inches,  and saying -rO1i sets the page
offset to one inch, instead of zero. (That's a  capital  O  after
-r, not a zero.)

Citing Papers with Refer

     The refer program normally copies input  to  output,  except
when it encounters an item of the form:

        partial  citation

The partial citation may be just an author's name and a date,  or
perhaps  a  title and a keyword, or maybe just a document number.
Refer looks up the citation in the  bibliographic  database,  and
transforms  it  into a full, properly formatted reference. If the
partial citation  does  not  correctly  identify  a  single  work
(either  finding nothing, or more than one reference), a diagnos-
tic message is given. If nothing is found, it will say  "No  such
paper."  If  more  than  one reference is found, it will say "Too
many hits." Other diagnostic messages can be  quite  cryptic;  if
you  are  in doubt, use checknr to verify that all your .['s have
matching .]'s.

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     When everything goes well, the reference will be brought  in
from  the  database,  numbered,  and  placed at the bottom of the
page. This citation,[1] for example, was produced by:

        This citation,
        lesk  inverted  indexes
        for example, was produced by

The .[ and .] markers, in essence, replace the .FS and .FE of the
-ms  macros,  and  also  provide  a numbering mechanism. Footnote
numbers will be bracketed on  the  the  lineprinter,  but  super-
scripted  on daisy-wheel terminals and in troff. In the reference
itself, articles will be quoted, and books and journals  will  be
underlined in nroff, and italicized in troff.

     Sometimes you need to cite a specific page number along with
more  general bibliographic material. You may have, for instance,
a single document that you refer to several times, each time giv-
ing  a different page citation. This is how you could get "p. 10"
in the reference:

        kies  document  formatting
        %P      10

The first line, a partial citation, will find  the  reference  in
your  bibliography.  The  second line will insert the page number
into the final citation. Ranges of  pages  may  be  specified  as
"%P 56-78".

     When the time comes to run off a paper,  you  will  need  to
have two files: the bibliographic database, and the paper to for-
mat. Use a command line something like one of these:

        % refer  -p  database  paper | nroff  -ms
        % refer  -p  database  paper | tbl | nroff  -ms
        % refer  -p  database  paper | tbl | neqn | nroff  -ms

If other preprocessors are used, refer should precede tbl,  which
must  in  turn  precede  eqn  or  neqn. The -p option specifies a
"private" database, which most bibliographies are.

Refer's Command-line Options

     Many people like  to  place  references  at  the  end  of  a
chapter,  rather  than  at  the bottom of the page. The -e option
  [1] Mike E. Lesk, "Some Applications of  Inverted  Indexes
on the Unix System," Unix Programmer's Manual, vol. 2a, Bell
Laboratories, Murray Hill, NJ, 1978.

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will accumulate references until a macro sequence of the form


is encountered (or until the end of file). Refer will then  write
out all references collected up to that point, collapsing identi-
cal references. Warning: there is a limit (currently 200) on  the
number of references that can be accumulated at one time.

     It is also possible to sort references that  appear  at  the
end of text. The -sKEYS flag will sort references by fields whose
key-letters are in the KEYS string, and permute reference numbers
in  the  text  accordingly.  It is unnecessary to use -e with it,
since -s implies -e. Key-letters in KEYS may be followed by a `+'
to  indicate  that all such fields are to be used. The default is
to sort by senior author and date, but -sA+D  will  sort  on  all
authors  and  then  date, and -sA+T will sort by authors and then

     Refer can also make citations in what is known as the Social
or  Natural Sciences format. Instead of numbering references, the
-l (letter ell) flag makes labels from the senior  author's  last
name and the year of publication. For example, a reference to the
paper  on  Inverted  Indexes  cited   above   might   appear   as
[Lesk1978a].  It  is possible to control the number of characters
in the last name, and the number  of  digits  in  the  date.  For
instance,  the command line argument -l6,2 might produce a refer-
ence such as [Kernig78c].

     Some bibliography standards shun both footnote  numbers  and
labels  composed  of  author  and date, requiring some keyword to
identify the reference. The -k flag indicates  that,  instead  of
numbering  references, key labels specified on the %L line should
be used to mark references.

     The -n flag means to not search the default reference  file,
located  in  /usr/dict/papers/Rv7man.  Using  this  flag may make
refer marginally faster. The -an flag will reverse  the  first  n
author names, printing Jones, J. A. instead of J. A. Jones. Often
-a1 is enough; this will reverse the names  of  only  the  senior
author.  In  some  versions of refer there is also the -f flag to
set the footnote number to some predetermined value; for example,
-f23 would start numbering with footnote 23.

Making an Index

     Once your database is large and relatively stable, it  is  a
good idea to make an index to it, so that references can be found
quickly and efficiently. The indxbib program  makes  an  inverted
index  to  the  bibliographic  database  (this  program is called
pubindex in the Bell Labs manual). An  inverted  index  could  be
compared  to  the  thumb cuts of a dictionary -- instead of going

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all the way through your bibliography, programs can move  to  the
exact location where a citation is found.

     Indxbib itself takes a while to run, and you will need  suf-
ficient  disk  space  to  store the indexes. But once it has been
run, access time will improve  dramatically.  Furthermore,  large
databases  of  several  million characters can be indexed with no
problem. The program is exceedingly simple to use:

        % indxbib  database

Be aware that changing your database will require  that  you  run
indxbib  over  again. If you don't, you may fail to find a refer-
ence that really is in the database.

     Once you have built an inverted index, you can  use  lookbib
to  find references in the database. Lookbib cannot be used until
you have run indxbib. When editing a paper, lookbib is very  use-
ful  to  make  sure that a citation can be found as specified. It
takes one argument, the name of the bibliography, and then  reads
partial  citations  from  the terminal, returning references that
match, or nothing if none match. Its prompt is  the  greater-than

        % lookbib  database
        > lesk inverted indexes
        %A      Mike E. Lesk
        %T      Some Applications of Inverted Indexes on the Unix System
        %J      Unix Programmer's Manual
        %I      Bell Laboratories
        %C      Murray Hill, NJ
        %D      1978
        %V      2a
        %X      Difficult to read paper that dwells on indexing strategies,
        giving little practical advice about using \fBrefer\fP.

If more than one reference comes back, you will have  to  give  a
more  precise citation for refer. Experiment until you find some-
thing that works; remember that it is harmless to overspecify. To
get out of the lookbib program, type a control-D alone on a line;
lookbib then exits with an ``EOT'' message.

     Lookbib can also be used to extract groups of related  cita-
tions.  For  example,  to  find all the papers by Brian Kernighan
found in the system database, and send  the  output  to  a  file,

        % lookbib  /usr/dict/papers/Ind  >  kern.refs
        > kernighan
        > EOT
        % cat  kern.refs

Your file, "kern.refs", will be full  of  references.  A  similar

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procedure  can  be  used to pull out all papers of some date, all
papers from a given journal,  all  papers  containing  a  certain
group of keywords, etc.

Refer Bugs and Some Solutions

     The refer program will mess up if there are  blanks  at  the
end  of  lines,  especially  the %A author line. Addbib carefully
removes trailing blanks, but they may creep in again during edit-
ing.  Use an editor command -- g/  *$/s///  -- to remove trailing
blanks from your bibliography.

     Having bibliographic fields passed through as string defini-
tions  implies  that  interpolated strings (such as accent marks)
must have two backslashes, so they can  pass  through  copy  mode
intact.  For  instance,  the  word  "t'l'phone"  would have to be


in order to come out correctly. In the %X field, by contrast, you
will  have to use single backslashes instead. This is because the
%X field is not passed through as a string, but as the body of  a
paragraph macro.

     Another problem arises from authors with foreign names. When
a name like "Val'ry Giscard d'Estaing" is turned around by the -a
option of refer, it will appear as "d'Estaing,  Val'ry  Giscard,"
rather  than  as  "Giscard  d'Estaing,  Val'ry." To prevent this,
enter names as follows:

        %A      Vale\\*'ry   Giscard\0d'Estaing
        %A      Alexander   Csoma\0de\0Ko\\*:ro\\*:s

(The second is the name of  a  famous  Hungarian  linguist.)  The
backslash-zero  is  an  nroff/troff  request  meaning to insert a
digit-width space. It will protect against faulty name  reversal,
and also against mis-sorting.

     Footnote numbers are placed at the end of  the  line  before
the .[ macro. This line should be a line of text, not a macro. As
an example, if the line before the .[ is a .R macro, then the  .R
will  eat  the footnote number. (The .R is an -ms request meaning
change to Roman font.) In cases where the font needs changing, it
is necessary to do the following:

        \fIet al.\fR
        awk  aho  kernighan  weinberger

Now the reference will be to Aho et al.[2]  The  \fI  changes  to
  [2] Alfred V. Aho, Brian W. Kernighan, and Peter J.  Wein-

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italics, and the \fR changes back to Roman font. Both  these
requests  are  nroff/troff requests, not part of -ms. If and
when a footnote number is added after this sequence, it will
indeed appear in the output.

Internal Details of Refer

     You have already read everything you need to know  in  order
to  use the refer bibliography system. The remaining sections are
provided only for extra information, and  in  case  you  need  to
change the way refer works.

     The output of refer is a stream of string  definitions,  one
for  each  field  in a reference. To create string names, percent
signs are simply changed to an open bracket, and an [F string  is
added,  containing  the footnote number. The %X, %Y and %Z fields
are ignored; however, the annobib program changes the  %X  to  an
.AP  (annotation paragraph) macro. The citation used above yields
this intermediate output:

        .ds [F 1
        .ds [A Mike E. Lesk
        .ds [T Some Applications of Inverted Indexes on the Unix System
        .ds [J Unix Programmer's Manual
        .ds [I Bell Laboratories
        .ds [C Murray Hill, NJ
        .ds [D 1978
        .ds [V 2a
        .nr [T 0
        .nr [A 0
        .nr [O 0
        .][  1  journal-article

These string definitions are sent to nroff, which can use the -ms
macros  defined  in /usr/lib/mx/tmac.xref to take care of format-
ting things properly. The initializing  macro  .]-  precedes  the
string  definitions, and the labeled macro .][ follows. These are
changed from the input .[ and .] so that  running  a  file  twice
through refer is harmless.

     The .][ macro, used to print the reference, is given a type-
number  argument, which is a numeric label indicating the type of
reference involved. Here is a list of the various kinds of refer-

berger,  "Awk - A Pattern Scanning and Processing Language,"
Unix Programmer's Manual, vol. 2a, Bell Laboratories, Murray
Hill, NJ, 1978.

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        Field   Value  Kind of Reference
        %J       1     Journal Article
        %B       3     Article in Book
        %R %G    4     Report, Government Report
        %I       2     Book
        %M       5     Bell Labs Memorandum (undefined)
        none     0     Other

The order listed above is indicative of  the  precedence  of  the
various  fields. In other words, a reference that has both the %J
and %B fields will be classified as a journal article. If none of
the  fields listed is present, then the reference will be classi-
fied as "other."

     The footnote number is flagged in the text with the  follow-
ing sequence, where number is the footnote number:


The \*([. and \*(.] stand for bracketing  or  superscripting.  In
nroff  with  low-resolution  devices  such  as the lpr and a crt,
footnote numbers will be bracketed. In troff, or  on  daisy-wheel
printers,  footnote  numbers  will  be superscripted. Punctuation
normally comes before the reference number; this can  be  changed
by using the -P (postpunctuation) option of refer.

     In some cases, it is necessary to override certain fields in
a  reference.  For  instance,  each time a work is cited, you may
want to specify different page  numbers,  and  you  may  want  to
change  certain  fields.  This citation will find the Lesk refer-
ence, but will add specific page  numbers  to  the  output,  even
though no page numbers appeared in the original reference.

        lesk  inverted  indexes
        %P      7-13
        %I      Computing Services
        %O      UNX 12.2.2.

The %I line will also override any  previous  publisher  informa-
tion, and the %O line will append some commentary. The refer pro-
gram simply adds the new %P, %I, and %O strings  to  the  output,
and later strings definitions cancel earlier ones.

     It is also possible to insert an entire citation  that  does
not  appear  in  the  bibliographic database. This reference, for
example, could be added as follows:

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        %A      Brian Kernighan
        %T      A Troff Tutorial
        %I      Bell Laboratories
        %D      1978

This will cause refer to interpret the fields exactly  as  given,
without  searching  the  bibliographic database. This practice is
not recommended, however, because it's better to add  new  refer-
ences to the database, so they can be used again later.

     If you want to change the way footnote numbers are  printed,
signals  can be given on the .[ and .] lines. For example, to say
"See reference (2)," the citation should appear as:

        See reference
        partial citation

Note that blanks are significant on these signal lines. If a per-
manent  change  in  the  footnote format is desired, it's best to
redefine the [. and .] strings.

Changing the Refer Macros

     This section is provided for those who wish  to  rewrite  or
modify  the refer macros. This is necessary in order to make out-
put correspond to specific journal requirements, or  departmental
standards. First there is an explanation of how new macros can be
substituted for the old ones. Then several alterations are  given
as  examples.  Finally,  there  is an annotated copy of the refer
macros used by roffbib.

     The refer macros for nroff/troff supplied by the  -ms  macro
package  reside in /usr/lib/mx/tmac.xref; they are reference mac-
ros, for producing footnotes or endnotes. The refer  macros  used
by  roffbib, on the other hand, reside in /usr/lib/tmac/tmac.bib;
they are for producing a stand-alone bibliography.

     To change the macros used by roffbib, you will need  to  get
your  own  version  of this shell script into the directory where
you are working. These two  commands  will  get  you  a  copy  of
roffbib and the macros it uses: -

        % cp  /usr/lib/tmac/tmac.bib  bibmac

You can proceed to change bibmac as much as you like.  Then  when
you  use roffbib, you should specify your own version of the mac-
ros, which will be substituted for the normal ones

        % roffbib  -m  bibmac  filename

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Refer - A Bibliography System                           USD:26-13

where filename is the name of your bibliography file.  Make  sure
there's a space between -m and bibmac.

     If you want to modify the refer macros for  use  with  nroff
and the -ms macros, you will need to get a copy of "tmac.xref":

        % cp  /usr/lib/ms/s.ref  refmac

These macros are much like "bibmac", except they have .FS and .FE
requests,  to  be used in conjunction with the -ms macros, rather
than independently defined .XP and .AP requests. Now you can  put
this line at the top of the paper to be formatted:

        .so  refmac

Your new refer macros will override  the  definitions  previously
read in by the -ms package. This method works only if "refmac" is
in the working directory.

     Suppose you didn't like  the  way  dates  are  printed,  and
wanted  them to be parenthesized, with no comma before. There are
five identical lines you will have  to  change.  The  first  line
below is the old way, while the second is the new way:

        .if  !"\\*([D""  ,  \\*([D\c
        .if  !"\\*([D""  \&  (\\*([D)\c

In the first  line,  there  is  a  comma  and  a  space,  but  no
parentheses.  The "\c" at the end of each line indicates to nroff
that it should continue, leaving no extra space  in  the  output.
The  "\&"  in  the  second line is the do-nothing character; when
followed by a space, a space is sent to the output.

     If you need to format a reference in the  style  favored  by
the  Modern  Language Association or Chicago University Press, in
the form (city: publisher, date), then you will  have  to  change
the middle of the book macro [2 as follows:

        \&  (\c
        .if  !"\\*([C""  \\*([C:
        .if  !"\\*([D""  ,  \\*([D\c

This would print (Berkeley:  Computing  Services,  1982)  if  all
three  strings  were present. The first line prints a space and a
parenthesis; the second prints the city (and a colon) if present;
the  third  always  prints  the publisher (books must have a pub-
lisher, or else they're classified as  other);  the  fourth  line
prints a comma and the date if present; and the fifth line closes
the parentheses. You would need to make similar  changes  to  the
other macros as well.

                        December 24, 2022

USD:26-14                           Refer - A Bibliography System


     Mike Lesk of Bell  Laboratories  wrote  the  original  refer
software,  including  the  indexing programs. Al Stangenberger of
the Forestry Department wrote the first version of  addbib,  then
called  bibin.  Greg  Shenaut of the Linguistics Department wrote
the original versions of sortbib and roffbib. All these contribu-
tions are greatly appreciated.

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Refer - A Bibliography System                            USD:26-1

                        Table of Contents

Introduction ..........................................    1

Data Entry with Addbib ................................    3

Printing the Bibliography .............................    4

Citing Papers with Refer ..............................    5

Refer's Command-line Options ..........................    6

Making an Index .......................................    7

Refer Bugs and Some Solutions .........................    9

Internal Details of Refer .............................   10

Changing the Refer Macros .............................   12

Acknowledgements ......................................   14

Commented Refer Macros ................................   15

                        December 24, 2022

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