\input zb-basic
\input zb-ioport
\iteman{io-port 70310400}
\itemau{Neumerkel, Ulrich}
\itemti{GUPU: A prolog course environment and its programming methodology (Poster abstract)}
\itemso{JICSLP, 549 (1996).}
\itemcc{}
\itemut{}
\itemli{}
\end