Abdul kareem, Qamar, and Zakariya Algamal. “Generalized Ridge Estimator Shrinkage Estimation Based on Particle Swarm Optimization Algorithm”. IRAQI JOURNAL OF STATISTICAL SCIENCES 17, no. 2 (December 1, 2020): 26–35. Accessed September 5, 2025. https://tanmiyat.uomosul.edu.iq/index.php/stats/article/view/29189.