\input zb-basic
\input zb-ioport
\iteman{io-port 50203772}
\itemau{Hasuike, Takashi; Ishii, Hiroaki}
\itemti{Product mix problems considering several probabilistic conditions and flexibility of constraints}
\itemso{Computers & Industrial Engineering 56, No. 3, 918-936 (2009).}
\itemcc{}
\itemut{}
\itemli{doi:10.1016/j.cie.2008.09.006}
\end