“Robust Estimation of Multiple Linear Regression Parameters in the Presence of a Problem of Heterogeneity of Variance and Outliers Values”. Journal of Economics and Administrative Sciences 26, no. 124 (December 1, 2020): 493–505. Accessed May 3, 2024. https://jeasiq.uobaghdad.edu.iq/index.php/JEASIQ/article/view/2054.