?url_ver=Z39.88-2004&rft_id=10.1002%2Fjctb.4191&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Y.A.&rft.au=Elsheikh%2C+Y.A.&rft.aulast=Elsheikh&rft.volume=89&rft.date=2014&rft.atitle=Evaluation+of+catalytic+activityof+two+functionalized+imidazolium+ionic+liquids+for+biodieselfuel+production+by+a+two-stage+process&rft.title=Journal+of+Chemical+Technology+and+Biotechnology&rft.issn=02682575&rft.issue=7&rft.pages=998-1006&rft.genre=article