Al ani, Ban, and Mahmmood Altai. “Application of Poisson’s Hierarchical Regression Model to the Deaths of Covid-19 in Mosul City Hospitals”. IRAQI JOURNAL OF STATISTICAL SCIENCES 19, no. 2 (December 1, 2022): 1–14. Accessed September 6, 2025. https://tanmiyat.uomosul.edu.iq/index.php/stats/article/view/29339.