1. Alteration of crude oils by water and bacteria — evidence from geochemical and istope studies;Bailey;Am. Assoc. Pet. Geol. Bull.,1973
2. Bacterial degradation of crude oil: comparison of field and experimental data;Bailey;Chem. Geol.,1973
3. Petroporphyrin fingerprinting as a geochemical marker;Barwise,1983
4. High-performance liquid chromatographic analysis of free-base porphyrins;Barwise;J. Chromatogr.,1986
5. Organic geochemistry of Venezuelan extra-heavy crude oils, 1. Pyrolysis of asphaltenes: A technique for the correlation and maturity evaluation of crude oils;Cassani;Chem. Geol.,1986