López-Cruz, Roxana. “Implications of the Delayed Feedback Effect on the Stability of a SIR Epidemic Model”. Selecciones Matemáticas 10, no. 01 (June 14, 2023): 29 - 40. Accessed May 9, 2024. https://revistas.unitru.edu.pe/index.php/SSMM/article/view/5030.