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\bibitem{Ashley:mvls}
J.~Michael Ashley and R.~Kent Dybvig.
\newblock An efficient implementation of multiple return values in scheme.
\newblock In {\em Proceedings of the 1994 {ACM} Conference on {Lisp} and
  Functional Programming}, pages 140--149, 1994.

\bibitem{Knuth-book:literate}
Donald~E. Knuth.
\newblock {\em Literate Programming}.
\newblock CSLI, Stanford University, Stanford, CA, 1992.

\bibitem{Ramsey-ieee:noweb}
Norman Ramsey.
\newblock Literate programming simplified.
\newblock {\em IEEE Software}, 11(5):97--105, Sept 1994.

\end{thebibliography}