\begin{thebibliography}{10}

\bibitem{att:gviz}
http://www.research.att.com/sw/tools/graphviz/.

\bibitem{org:gviz}
http://www.graphviz.org/.

\bibitem{omg:uml}
http://www.omg.org.

\bibitem{rational:rose}
http://www.rational.com.

\bibitem{unixprog2:book}
{\em System Calls and Library Routines}, volume~2 of {\em Unix programmer's
  manual}.
\newblock CBS College Publishing's Unix System Library, 1986.

\bibitem{berryall:req}
Daniel~M. Berry, Khuzaima Daudjee, Jing Dong, Maria~Augusta Nelson, and Torsten
  Nelson.
\newblock User's {M}anual as a {R}equirement {S}pecification.
\newblock Technical report, University of Waterloo, May 2001.

\bibitem{if:IBMcase}
Igor Finestein.
\newblock Requirements specification for a large-scale telephony-based natural
  language speech recognition system.
\newblock Master's thesis, School of Computer Science, University of Waterloo,
  Waterloo, ON, Canada, 2002.

\bibitem{fh:lan}
C.W. Fraser and D.R. Hanson.
\newblock High-level languages facilities for low-level services.
\newblock {\em 12th ACM Symp. on Prin. of Programming Languages}, pages
  217--224, 1985.

\bibitem{unixtype2:book}
Narain Gehani.
\newblock {\em Document Formatting and Typesetting on the Unix System second
  edition}.
\newblock Silicon Press, Summit, NJ, 1987.

\bibitem{bk:pic}
Brian~W. Kernighan.
\newblock {PIC} - {A G}raphics {L}anguages for {T}ypesetting.
\newblock {\em Bell Laboratories, Computer Science Technical Report No.116},
  December 1984.

\bibitem{bk:troff}
B.W. Kernighan.
\newblock A {T}ypesetter-independent {TROFF}.
\newblock {\em Computer Science Technical Report No.116, Bell Laboratories},
  March 1982.

\bibitem{ek:lefty}
Eleftherios Koutsofios.
\newblock Editing {P}ictures with lefty.
\newblock June 1996.

\bibitem{eksn:dot}
Eleftherios Koutsofios and Stephen North.
\newblock {\em Drawing graphs with dot}.
\newblock AT\&T Bell Laboratories, Murray Hill, NJ, February 2002.
\newblock http://www.research.att.com/sw/tools/graphviz/.

\bibitem{eksn:dotty}
Eleftherios Koutsofios and Stephen~C. North.
\newblock Editing graphs with dotty.
\newblock June 1996.

\bibitem{sn:neato}
Stephen~C. North.
\newblock {\em Drawing graphs with {NEATO}}, April 2002.

\bibitem{unixprog1:book}
Marc~J. Rochkind.
\newblock {\em Advanced Unix Programming}.
\newblock Prentice-Hall, Englewood Cliffs, NJ, 1985.

\bibitem{fs:wdpic}
Faina Shpilberg.
\newblock {WD}-pic, {A WYSIWYG D}irect-{M}anipulation pic.
\newblock Master's thesis, Faculty of Computer Science, Technion, Haifa,
  Israel, July 1997.

\bibitem{unixtype1:book}
B.~Srinivasan.
\newblock {\em Unix Document Processing and Typesetting}.
\newblock World Scientific, Singapore, New Jersey, London, 1993.

\end{thebibliography}
