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\newblock {\em Why Jane can't add and Johnny still can't spell}.
\newblock PhD thesis, Iowa State University, 1992.

\bibitem{knuth:86a}
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\newblock Addison--Wesley, Reading, Massachusetts, third edition, 1986.

\bibitem{gn:struss}
{Lin, E. C.}, {P. J. Berger}, and {J. A. Struss}.
\newblock Estimates of genetic parameters for growth and reproductive traits in
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\newblock {\em Journal of Animal Science}, 70 (Suppl.1):39, 1992.

\bibitem{mayer:81}
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\newblock The psychology of how novices learn programming.
\newblock {\em Computing Surveys}, 13(1):121--141, 1981.

\end{thebibliography}
