1. Stable Isotopes in Petroleum Exploration Source and Migration Process and Evaluation Techniques;Sofer,1991
2. Carbon isotopic composition of petroleums and other sedimentary organic materials;Silverman;Am. Assoc. Pet. Geol. Bull.,1958
3. Investigations of Petroleum Origin and Evolution Mechanisms by Carbon Isotope Studies;Silverman,1964
4. Carbon isotopic composition of crude oils from Ellenburger group (Lower Ordovician), Permian basin West Texas and Eastern New Mexico;Kvenvolden;Am. Assoc. Pet. Geol. Bull.,1967
5. Implications of carbon isotopic composition of total organic carbon of some recent sediments and ancient oils;Eckelman;Am. Assoc. Pet. Geol. Bull.,1962