Tintinago-Ruiz, P. C., E. . González-Olivares, and A. Rojas-Palma. “Dynamics of a Predation Model Considering Sigmoid Functional Response and Alternative Food for Predators”. Selecciones Matemáticas, vol. 9, no. 02, Dec. 2022, pp. 275 -86, doi:10.17268/sel.mat.2022.02.05.