1. Geochemical transformations of petroleum in the lithosphère;Andreev;Geochemistry,1962
2. An X-ray study of carbonization;Blayden;Fuel Sci. Practices,1939
3. Change in the structural state of graphite during progressive regional metamorphism;Blyuman;Dokl. Akad. Nauk SSSR,1972
4. Thermal alteration of the organic matter in sediments;Douglas,1970
5. Insoluble organic matter (kerogen) in sedimentary rocks of marine origin;Foresman,1958