Laarabi, Hassan, El Houssine Houssine Labriji, Mostafa Rachik, and Abdelilah Kaddar. “Optimal Control of an Epidemic Model With a Saturated Incidence Rate”. Nonlinear Analysis: Modelling and Control 17, no. 4 (October 25, 2012): 448–459. Accessed May 4, 2024. https://www.journals.vu.lt/nonlinear-analysis/article/view/14050.