\input zb-basic
\input zb-ioport
\iteman{io-port 50347979}
\itemau{Goldengorin, Boris; Keane, John A.; Kuzmenko, Viktor; Tso, Michael}
\itemti{Optimal supplier choice with discounting}
\itemso{JORS 62, No. 4, 690-699 (2011).}
\itemcc{}
\itemut{}
\itemli{doi:10.1057/jors.2009.164}
\end