Morán-Zenteno, Dante J., et al. “Stratigraphy, Geochemistry and Tectonic Significance of the Tertiary Volcanic Sequences of the Taxco-Quetzalapa Region, Southern Mexico”. Revista Mexicana De Ciencias Geológicas, vol. 15, no. 2, Dec. 2018, pp. 167-80, https://rmcg.geociencias.unam.mx/index.php/rmcg/article/view/1100.