Khazal Rashad, Nadwa, and Nawal Mahmoud Hammoud. “Biased Estimators in Zero-Inflated Poisson Regression Model in the Presence of Multicollinearity: Subject Review”. College of Basic Education Research Journal 20, no. 1 (March 1, 2024): 819–842. Accessed October 26, 2025. https://moss.uomosul.edu.iq/index.php/berj/article/view/39002.