\input zb-basic
\input zb-ioport
\iteman{io-port 50298860}
\itemau{Rackham, Tom}
\itemti{The number of defective colorings of graphs on surfaces}
\itemso{Journal of Graph Theory 68, No. 2, 129-136 (2011).}
\itemcc{}
\itemut{}
\itemli{doi:10.1002/jgt.20546}
\end