\input zb-basic
\input zb-ioport
\iteman{io-port 50130365}
\itemau{Kassoff, Michael; Valente, Andr\'e}
\itemti{An introduction to logical spreadsheets}
\itemso{Knowledge Eng. Review 22, No. 3, 213-219 (2007).}
\itemcc{}
\itemut{}
\itemli{doi:10.1017/S0269888907001191}
\end