Rida, S. Z., A.S. Abdel Rady, Anas Arafa, and M. Khalil. “Approximate Analytical Solution of the Fractional Epidemic Model”. International Journal of Applied Mathematical Research 1, no. 1 (April 6, 2012): 17–29. Accessed May 7, 2024. https://sciencepubco.com/index.php/ijamr/article/view/20.