\input zb-basic
\input zb-ioport
\iteman{io-port 50089888}
\itemau{Groshaus, Marina; Szwarcfiter, Jayme Luiz}
\itemti{On hereditary Helly classes of graphs}
\itemso{Discrete Mathematics & Theoretical Computer Science 10, No. 1 (2008).}
\itemcc{}
\itemut{}
\itemli{http://www.dmtcs.org/dmtcs-ojs/index.php/dmtcs/article/view/744/2187}
\end