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FRANCISCO SOUR-TOVAR,1 SARA A. QUIROZ-BARROSO,1 SHELTON P. APPLEGATE2
1Museo de Paleontología de la Facultad de Ciencias, Universidad Nacional Autónoma de Mexico, Ciudad Universitaria, 04510-Mexico, D. F. Mexico, email@example.com 2Instituto de Geología, Universidad Nacional Autónoma de Mexico, Ciudad Universitaria, 04510-Mexico, D.F., Mexico
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FRANCISCO SOUR-TOVAR, SARA A. QUIROZ-BARROSO, SHELTON P. APPLEGATE "PRESENCE OF HELICOPRION (CHONDRICHTHYES, ELASMOBRANCHII) IN THE PERMIAN PATLANOAYA FORMATION, PUEBLA, MEXICO," Journal of Paleontology, 74(2), 363-366, (1 March 2000)