Ajbar, Abdelhamid Mohamed, Emad Ali, and Aymane Ajbar. “Modelling the Evolution of the Coronavirus Disease (COVID-19) in Saudi Arabia”. The Journal of Infection in Developing Countries 15, no. 07 (July 31, 2021): 918–924. Accessed April 25, 2024. https://jidc.org/index.php/journal/article/view/34343116.