Abidemi, Afeez, Fatmawati, and Olumuyiwa James Peter. “Deterministic Double Dose Vaccination Model of COVID-19 Transmission Dynamics - Optimal Control Strategies With Cost-Effectiveness Analysis”. Communication in Biomathematical Sciences 7, no. 1 (June 25, 2024): 1-33. Accessed October 4, 2025. https://journals.itb.ac.id/index.php/cbms/article/view/21937.