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Cisneros, J.C.; Abdala, F.; Rubidge, B.S.; Dentzien-Dias, D.; Bueno, A.O. (2011). «Dental Occlusion in a 260-Million-Year-Old Therapsid with Saber Canines from the Permian of Brazil». Science331: 1603-1605. Bibcode:2011Sci...331.1603C. PMID21436452. doi:10.1126/science.1200305.
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Cisneros, J.C.; Abdala, F.; Rubidge, B.S.; Dentzien-Dias, D.; Bueno, A.O. (2011). «Dental Occlusion in a 260-Million-Year-Old Therapsid with Saber Canines from the Permian of Brazil». Science331: 1603-1605. Bibcode:2011Sci...331.1603C. PMID21436452. doi:10.1126/science.1200305.
Cisneros, J.C.; Abdala, F.; Rubidge, B.S.; Dentzien-Dias, D.; Bueno, A.O. (2011). «Dental Occlusion in a 260-Million-Year-Old Therapsid with Saber Canines from the Permian of Brazil». Science331: 1603-1605. Bibcode:2011Sci...331.1603C. PMID21436452. doi:10.1126/science.1200305.