Luhr, J.F. 1993. Petrology and geochemistry of stage-I andesites and dacites from the caldera wall of Vol can Colima, Mexico. Geofísica Internacional. 32, 4 (oct. 1993), 591–603. DOI:https://doi.org/10.22201/igeof.00167169p.1993.32.4.605.