SOUR-TOVAR, Francisco; PÉREZ-HUERTA, Alberto; QUIROZ-BARROSO, Sara A.; CENTENO-GARCÍA, Elena. Lower Permian brachiopods and trilobite from northwerstern Hidalgo State, Mexico. Revista Mexicana de Ciencias Geológicas, [S. l.], v. 22, n. 1, p. 24–35, 2018. Disponível em: https://rmcg.unam.mx/index.php/rmcg/article/view/862. Acesso em: 15 mar. 2025.