Safar Elias Al-Saffar, Avan, and Zakaria Y. Algamal. “Improving Generalized Ridge Estimator for the Gamma Regression Model”. IRAQI JOURNAL OF STATISTICAL SCIENCES 21, no. 1 (June 1, 2024): 102–111. Accessed September 6, 2025. https://tanmiyat.uomosul.edu.iq/index.php/stats/article/view/29012.