Ahmed M. Kareem, and Saad Naji Al-Azzawi. “A Stochastic Differential Equations Model for the Spread of Coronavirus COVID-19): The Case of Iraq”. Iraqi Journal of Science 62, no. 3 (March 30, 2021): 1025-1035. Accessed December 6, 2021. https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/3310.