?url_ver=Z39.88-2004&rft_id=10.1155%2F2015%2F917093&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Vasant&rft.au=Vasant%2C+P.&rft.aufirst=P.&rft.volume=2015&rft.issn=1024123X&rft.atitle=Classical+and+hybrid+optimization+approaches+and+their+applications+in+engineering+and+economics&rft.title=Mathematical+Problems+in+Engineering&rft.date=2015&rft.genre=article