Ortiz-Hernández, Luis Enrique, Kinardo Flores-Castro, and Otilio Arturo Acevedo-Sandoval. 2018. “Petrographic and Geochemical Characteristics of Upper Aptian Calc-Alkaline Volcanism in San Miguel De Allende, Guanajuato State, Mexico”. Revista Mexicana De Ciencias Geológicas 19 (2):81-90. https://rmcg.unam.mx/index.php/rmcg/article/view/976.