\input zb-basic
\input zb-ioport
\iteman{io-port 50156583}
\itemau{Borg, Peter}
\itemti{On Chv\`atal's conjecture and a conjecture on families of signed sets}
\itemso{Eur. J. Comb. 32, No. 1, 140-145 (2011).}
\itemcc{}
\itemut{}
\itemli{doi:10.1016/j.ejc.2010.07.002}
\end