\input zb-basic
\input zb-ioport
\iteman{io-port 05388026}
\itemau{Ervin, Stephen M.; Gross, Mark D.}
\itemti{Roadlab - A constraint based laboratory for road design.}
\itemso{AI Eng. 2, No. 4, 224-234 (1987).}
\itemcc{}
\itemut{}
\itemli{doi:10.1016/0954-1810(87)90193-2}
\end