Afolabi, Ayodeji Sunday, and Abdulwahab Ridwan. “Mathematical Modeling of COVID-19: An Optimal Control Approach”. Jambura Journal of Biomathematics (JJBM) 7, no. 1 (March 17, 2026): 1–27. Accessed April 24, 2026. https://jjbm.fmipa.ung.ac.id/index.php/ejournal/article/view/2.