Majid A, Aslam M, Amanullah M, Altaf S. On Inference of the Linear Regression Model with Groupwise Heteroscedasticity. Pak.j.stat.oper.res. [Internet]. 2017Jun.1 [cited 2025Aug.26];13(2):265-76. Available from: https://pjsor.com/pjsor/article/view/1345