Umair Tariq, M. ., M. Nouman Qureshi, and M. . Hanif. “Variance Estimators in the Presence of Measurement Errors Using Auxiliary Information”. Thailand Statistician, vol. 19, no. 3, June 2021, pp. 606-1, https://ph02.tci-thaijo.org/index.php/thaistat/article/view/244524.