?url_ver=Z39.88-2004&rft_id=10.15282%2Fijame.11.2015.6.0187&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Firmansyah&rft.aulast=Firmansyah&rft.issn=22298649&rft.atitle=Investigation+of+auto-ignition+of+octane-CNG+mixture+in+HCCI+engine&rft.title=International+Journal+of+Automotive+and+Mechanical+Engineering&rft.date=2015&rft.pages=2235-2242&rft.volume=11&rft.issue=1&rft.genre=article