\input zb-basic
\input zb-ioport
\iteman{io-port 70331237}
\itemau{Summers, Kenneth L.; Goldsmith, Timothy E.; Kubica, Steve; Caudell, Thomas P.}
\itemti{An experimental evaluation of continuous semantic zooming in program visualization}
\itemso{INFOVIS (2003).}
\itemcc{}
\itemut{}
\itemli{http://csdl.computer.org/comp/proceedings/infovis/2003/2055/00/20550020abs.htm}
\end