\input zb-basic
\input zb-ioport
\iteman{io-port 70883910}
\itemau{Horvitz, Eric}
\itemti{Principles of mixed-initiative user interfaces}
\itemso{CHI, 159-166 (1999).}
\itemcc{}
\itemut{}
\itemli{doi:10.1145/302979.303030}
\end