Karkri, Jaafar El. “Asymptotic Behavior of an SIS Epidemic Model With Delay”. Discontinuity, Nonlinearity, and Complexity 11, no. 1 (March 1, 2022): 149–160. Accessed October 17, 2026. https://lhscientificpublishing.com/index.php/DNC/article/view/2088.