Madge Escobedo, J. and Pérez Núñez, J.R. 2022. Analysis and simulation of an extended SEIR mathematical model with vaccination for the spread of SARS-COV-2. Selecciones Matemáticas. 9, 01 (Jul. 2022), 121 - 136. DOI:https://doi.org/10.17268/sel.mat.2022.02.09.