Ponce Lira, Brenda, Araceli Ortiz Polo, Elena María Otazo Sánchez, Edilso Reguera Ruiz, Otilio Arturo Acevedo Sandoval, Francisco Prieto Garcia, and César Abelardo Gonzalez Ramírez. 2013. “Physical Characterization of an Extensive Volcanic Rock in México: ‘red tezontle’ from Cerro De La Cruz, in Tlahuelilpan, Hidalgo, Mexico”. Acta Universitaria 23 (4): 9-16. https://doi.org/10.15174/au.2013.462.