Abdullah, Zahraa K., Emna Ouhibi, and Saad Naji Al-Azzawi. “Fractional Modelling for COVID-19 in the World and Iraq”. Ibn AL-Haitham Journal For Pure and Applied Sciences 37, no. 2 (April 20, 2024): 378–387. Accessed March 29, 2025. https://jih.uobaghdad.edu.iq/index.php/j/article/view/3359.