?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Aziz%2C+A.-R.A.&rft.aulast=Aziz&rft.aufirst=A.-R.A.&rft.issn=07365721&rft.title=Performance+and+emission+comparison+of+a+direct-injection+(DI)+internal+combustion+engine+using+hydrogen+and+compressed+natural+gas+as+fuels&rft.isbn=9781615678709&rft.date=2008&rft.genre=proceeding