\input zb-basic
\input zb-ioport
\iteman{io-port 50030905}
\itemau{Kirchherr, Walter W.}
\itemti{Graph operations and Zipfian degree distributions}
\itemso{Electronic Notes in Discrete Mathematics 11, 438-442 (2002).}
\itemcc{}
\itemut{}
\itemli{doi:10.1016/S1571-0653(04)00088-5}
\end