Sour-Tovar, F., Pérez-Huerta, A., Quiroz-Barroso, S. A., & Centeno-García, E. (2018). Lower Permian brachiopods and trilobite from northwerstern Hidalgo State, Mexico. Revista Mexicana De Ciencias Geológicas, 22(1), 24–35. Retrieved from https://rmcg.unam.mx/index.php/rmcg/article/view/862