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. Science. 331: 1603—1605. doi:10.1126/science.1200305. PMID21436452.
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. Science. 331: 1603—1605. doi:10.1126/science.1200305. PMID21436452.