Cifuentes-Faura, Javier. “Effect of Population Density and Economic Indicators on COVID-19 Death Rates in the Community of Latin American and Caribbean States”. Puerto Rico Health Sciences Journal, vol. 41, no. 4, Dec. 2022, pp. 192-6, https://prhsj.rcm.upr.edu/index.php/prhsj/article/view/2823.