García-Palomo, A., Macías, J.L., Tolson, G., Valdez, G. y Mora, J.C. 2002. Volcanic stratigraphy and geological evolution of the Apan region, east-central sector of the Trans-Mexican Volcanic Belt. Geofísica Internacional. 41, 2 (abr. 2002), 133–150. DOI:https://doi.org/10.22201/igeof.00167169p.2002.41.2.282.