?url_ver=Z39.88-2004&rft_id=10.1016%2Fj.scitotenv.2020.137833&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Isa&rft.au=Isa%2C+M.H.&rft.aufirst=M.H.&rft.volume=722&rft.issn=00489697&rft.atitle=Improved+anaerobic+digestion+of+palm+oil+mill+effluent+and+biogas+production+by+ultrasonication+pretreatment&rft.title=Science+of+the+Total+Environment&rft.date=2020&rft.genre=article