1. Petroleum Geochemistry and Geology;JM Hunt,1979
2. Martinez AR, editor. The Future of Heavy Crude and Tar Sands, Second International Conference; 1984; New York, NY, USA.: McGraw-Hill.
3. California Plio-Miocene Oils: Evidence of Early Generation: Section III;N Petersen;Geological Environments and Migration,1987
4. Composition and structure of heavy oils;V Leon;JCODICID,2000