Vargas-Pichón, H. B., E. A. Coayla-Teran, and E. Tejada-Vásquez. “The SIRD Epidemiological Model Applied to Spread of the COVID-19 in the Peruvian región of Tacna”. Selecciones Matemáticas, vol. 9, no. 01, July 2022, pp. 137 -44, doi:10.17268/sel.mat.2022.01.10.