\input zb-basic
\input zb-ioport
\iteman{io-port 03781233}
\itemau{Sobik, Fred}
\itemti{Graphmetriken und Klassifikation strukturierter Objekte.}
\itemso{ZKI Inf., Akad. Wiss. DDR 2/82, 63-122 (1982).}
\itemcc{}
\itemut{classification problems; sets of graphs; induced subgraphs; line graphs}
\itemli{}
\end