?url_ver=Z39.88-2004&rft_id=10.1109%2FWAC.2006.376048&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=P.M.&rft.aulast=Vasant&rft.au=Vasant%2C+P.M.&rft.date=2006&rft.title=A+fuzzy+cost+function+optimization+in+product+mix+selection+problem&rft.isbn=1889335339%3B+9781889335339&rft.genre=proceeding