Anekwe, Stella, and Sidney Onyeagu. “The Redescending M Estimator For Detection and Deletion of Outliers in Regression Analysis”. Pakistan Journal of Statistics and Operation Research 17, no. 4 (December 2, 2021): 997-1014. Accessed July 31, 2025. https://pjsor.com/pjsor/article/view/3546.