?url_ver=Z39.88-2004&rft_id=10.1016%2Fj.applthermaleng.2021.116944&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Zainal+A.%2C+E.Z.&rft.aulast=Zainal+A.&rft.aufirst=E.Z.&rft.date=2021&rft.title=Applied+Thermal+Engineering&rft.atitle=Effect+of+aspect+ratio+on+frequency+and+power+generation+of+a+free-piston+linear+generator&rft.volume=192&rft.issn=13594311&rft.genre=article