\input zb-basic
\input zb-ioport
\iteman{io-port 50288361}
\itemau{Esparza, Javier; Rossmanith, Peter; Schwoon, Stefan}
\itemti{A uniform framework for problems on context-free grammars}
\itemso{Bulletin of the EATCS 72, 169-177 (2000).}
\itemcc{}
\itemut{}
\itemli{}
\end