J. C. Martínez Arredondo, V. M. Ortega-Chávez, and Y. R. Ramos Arroyo, “Regional climatic indices for the Sierra Gorda of Guanajuato”, Acta Universitaria, vol. 23, no. 6, pp. 10–25, Jan. 2014, doi: 10.15174/au.2013.486.