Račkauskas, Alfredas, and Danas Zuokas. “Properties of the Coefficient Estimators for the Linear Regression Model With Heteroskedastic Error Term”. Lietuvos matematikos rinkinys 46, no. spec. (September 21, 2023): 267–272. Accessed May 16, 2024. https://www.journals.vu.lt/LMR/article/view/30725.