Hussain S, Sheikh N, Anjum M, Raza AG, Rizvi R. Mathematical modelling of COVID-19 pandemic in Pakistan with optimal control. 5003 [Internet]. 2023 Feb. 7 [cited 2024 May 17];13(1):28-44. Available from: http://archive.aessweb.com/index.php/5003/article/view/4721