Avila-Ortega, Daniel Itzamna, and Cynthia Flores-Santana. “An Index of Municipality-Level Vulnerability to COVID-19 in Mexico”. Terra digitalis 4, no. 2 (October 31, 2020): 1–11. Accessed April 20, 2026. https://terradigitalis.igg.unam.mx/html/ojs3/index.php/terra_digitalis/article/view/73.