?url_ver=Z39.88-2004&rft_id=10.3182%2F20050703-6-cz-1902.02272&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=P.M.&rft.au=Vasant%2C+P.M.&rft.aulast=Vasant&rft.issn=14746670&rft.isbn=008045108X%3B+9780080451084&rft.title=Fuzzy+optimization+of+cost+function+in+product+mix+selection+problem&rft.date=2005&rft.genre=proceeding