\input zb-basic
\input zb-ioport
\iteman{io-port 70119782}
\itemau{Davoli, Renzo; Goldweber, Michael}
\itemti{Virtual square (${\it V^{2}}$) in computer science education}
\itemso{ITiCSE, 301-305 (2005).}
\itemcc{}
\itemut{}
\itemli{doi:10.1145/1067445.1067528}
\end