\input zb-basic
\input zb-ioport
\iteman{io-port 70733542}
\itemau{Van Ruymbeke, G.; Krummenacher, F.}
\itemti{A programmable continuous-time filter}
\itemso{ISCAS, 1263-1266 (1993).}
\itemcc{}
\itemut{}
\itemli{}
\end