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2. Novel tricyclic terpanes (C19, C20) in sediments and petroleums;Aquino Neto;Tetrahedron Letters,1982
3. Origin and occurrence of 25-norhopanes;Blanc;Organic Geochemistry,1992
4. Geology and geochemistry of crude oils, Bolivar Coastal Fields, Venezuela;Bockmeulen;American Association of Petroleum Geologists Bulletin,1983
5. Organic geochemistry of Venezuelan extra-heavy oils-1;Cassani;Chemical Geology,1986