\input zb-basic
\input zb-ioport
\iteman{io-port 50156963}
\itemau{Feng, Rongquan}
\itemti{Preface}
\itemso{Eur. J. Comb. 29, No. 6, 1377-1378 (2008).}
\itemcc{}
\itemut{}
\itemli{doi:10.1016/j.ejc.2007.06.012}
\end