\input zb-basic
\input zb-ioport
\iteman{io-port 50366343}
\itemau{Lowe, Nick; Datta, Amitava}
\itemti{A new technique for rendering complex portals}
\itemso{IEEE Trans. Vis. Comput. Graph. 11, No. 1, 81-90 (2005).}
\itemcc{}
\itemut{}
\itemli{http://doi.ieeecomputersociety.org/10.1109/TVCG.2005.1}
\end