R. Naji and A. Muhseen, “Stability and Bifurcation of Epidemic Model”, Iraqi Journal of Science, vol. 54, no. 3. Mathematics conf, pp. 764–774, Feb. 2024, Accessed: Jan. 05, 2026. [Online]. Available: https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/12458