\input zb-basic
\input zb-ioport
\iteman{io-port 05922992}
\itemau{Kreutzer, Stephan; Tazari, Siamak}
\itemti{Directed nowhere dense classes of graphs.}
\itemso{Comput. Res. Repos. 2011, Article No. 1104.3808 (2011).}
\itemcc{}
\itemut{}
\itemli{http://arxiv.org/abs/1104.3808}
\end