?url_ver=Z39.88-2004&rft_id=10.1002%2Fer.6345&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Umar%2C+H.A.&rft.aulast=Umar&rft.aufirst=H.A.&rft.volume=45&rft.issn=0363907X&rft.issue=5&rft.atitle=Syngas+production+from+gasification+and+co-gasification+of+oil+palm+trunk+and+frond+using+a+down-draft+gasifier&rft.pages=8103-8115&rft.title=International+Journal+of+Energy+Research&rft.date=2021&rft.genre=article