khaleel, Shaimaa ibraheem, and ghufran ismaeel kamal. “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, vol. 26, no. 124, Dec. 2020, pp. 493-05, https://doi.org/10.33095/jeas.v26i124.2054.