?url_ver=Z39.88-2004&rft_id=10.1109%2FPECON.2008.4762637&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aulast=Zulkifli&rft.au=Zulkifli%2C+S.A.&rft.aufirst=S.A.&rft.date=2008&rft.title=Rectangular+current+commutation+and+open-loop+control+for+starting+of+a+free-piston+linear+engine-generator&rft.isbn=9781424424054&rft.genre=proceeding