?url_ver=Z39.88-2004&rft_id=10.4271%2F2009-01-1498&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=A-Aziz%2C+A.-R.&rft.aulast=A-Aziz&rft.aufirst=A.-R.&rft.issn=01487191&rft.atitle=The+effect+of+fuel+rail+pressure+on+the+performance+of+a+CNG-direct+injection+engine&rft.title=SAE+Technical+Papers&rft.date=2009&rft.genre=article