\input zb-basic
\input zb-ioport
\iteman{io-port 70239129}
\itemau{Klein, Hans-Joachim; Kr\"amer, Dirk}
\itemti{NQS - A graphical query system for data models with binary relationship types}
\itemso{VDB, 394-409 (1995).}
\itemcc{}
\itemut{}
\itemli{}
\end