Srivastava, Manindra, and Purnima Srivastava. “Mathematics for Infectious Diseases; Deterministic Models: A Key”. SAMRIDDHI : A Journal of Physical Sciences, Engineering and Technology 7, no. 01 (June 25, 2015): 37-42. Accessed November 14, 2025. https://www.smsjournals.com/index.php/SAMRIDDHI/article/view/1126.