Urrutia-Fucugauchi, Jaime. “Constraints on Brunhes Low-Latitude Paleosecular Variation Iztaccihuatl Stratovolcano, Basin of Mexico”. Geofisica Internacional 34, no. 3 (July 1, 1995): 253–262. Accessed July 23, 2024. http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/690.