?url_ver=Z39.88-2004&rft_id=10.1109%2FVPPC.2008.4677748&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=S.A.&rft.aulast=Zulkifli&rft.au=Zulkifli%2C+S.A.&rft.isbn=9781424418497&rft.date=2008&rft.title=Starting+of+a+free-piston+linear+engine-generator+by+mechanical+resonance+and+rectangular+current+commutation&rft.genre=proceeding