1. J.B. Hansen et al: SAE950063 (Feb. 1995)
2. Air products and Chemicals: DOE/PC/90018-T7 (June. 1993)
3. The 2nd International Oil, Gas & Petrochemical Congress, Tehran;Romaini,2000
4. Preprints of Papers Presented at the 213th ACS National Meeting, Div. Of Fuel Chemistry;Ohno,1997