Mohamad Zainizam, Nur Allia, and Hamizah Mohd Safuan. “A SIR Model Assumption for the Spread of COVID-19 With the Effects of Vaccination”. Enhanced Knowledge in Sciences and Technology 2, no. 1 (August 3, 2022): 231–240. Accessed July 18, 2024. https://publisher.uthm.edu.my/periodicals/index.php/ekst/article/view/5437.