?url_ver=Z39.88-2004&rft_id=10.1016%2Fj.jclepro.2016.05.003&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=L.F.&rft.au=Chuah%2C+L.F.&rft.aulast=Chuah&rft.issn=09596526&rft.atitle=Influence+of+green+catalyst+on+transesterification+process+using+ultrasonic-assisted&rft.title=Journal+of+Cleaner+Production&rft.date=2016&rft.pages=14-22&rft.volume=136&rft.genre=article