?url_ver=Z39.88-2004&rft_id=10.1016%2Fj.ijhydene.2020.12.122&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Zainal+A&rft.au=Zainal+A%2C+E.Z.&rft.aufirst=E.Z.&rft.issn=03603199&rft.date=2021&rft.issue=17&rft.atitle=Effect+of+aspect+ratio+on+the+performance+characteristics+of+free+piston+linear+generator+engine+fueled+by+hydrogen&rft.pages=10506-10517&rft.volume=46&rft.title=International+Journal+of+Hydrogen+Energy&rft.genre=article