Neto EVaz dos Sa, Hayes JM.  1999.  Use of Hydrogen and Carbon Stable Isotopes in the Characterization of Oils from the Potiguar Basin (onshore), Northeastern Brazil. Bulletin of the American Association of Petroleum Geologists. 83:496-518.

Neto EVaz dos Sa, Hayes JM, Takaki T.  1998.  Isotopic Biogeochemistry of the Neocomian Lacustrine and Upper Aptian Marine-Evaporitic Sediments of the Potiguar Basin, Northeastern Brazil. Organic Geochemistry. 28:361-382.

Neto EVaz dos Sa, Hayes JM, Takaki T.  1998.  Paleoclimatic Assessment of Cretaceous Lacustrine and Marine-Evaporitic Sequences from the Potiguar Basin Based on the Hydrogen Isotopic Compositions of Saturated Hydrocarbons. Revista Latino Americana de Geoquimica Ogranica. 4:5-24.