?url_ver=Z39.88-2004&rft_id=10.1016%2Fj.enconman.2010.08.005&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Elsheikh%2C+Y.A.&rft.aulast=Elsheikh&rft.aufirst=Y.A.&rft.issue=2&rft.volume=52&rft.issn=01968904&rft.pages=804-809&rft.atitle=Br%C3%83%C2%B8nsted+imidazolium+ionic+liquids%3A+Synthesis+and+comparison+of+their+catalytic+activities+as+pre-catalyst+for+biodiesel+production+through+two+stage+process&rft.title=Energy+Conversion+and+Management&rft.date=2011&rft.genre=article