Jibril, Muhammad Lawan, Mohammed Bappah Mohammed, and Usman Sani Sharif. “Susceptible Infectious and Recovered Model for Severity of COVID-19 Pandemic in Nigeria”. Journal of Statistical Modeling & Analytics (JOSMA) 5, no. 1 (March 20, 2023). Accessed November 25, 2024. http://jummec.um.edu.my/index.php/JOSMA/article/view/33959.