R. Magallanes-Quintanar, F. Blanco-Macías, E. C. Galván-Tejada, J. I. Galván-Tejada, M. Márquez-Madrid, and R. D. Valdez-Cepeda, “Negative regional Standardized Precipitation Index trends prevail in the Mexico’s state of Zacatecas”, Terra Latinoam, vol. 37, no. 4, pp. 487–499, Oct. 2019.