Abdia, Younathan, and Muhammad Qaiser Shahbaz. “A Comparative Study of Generalized Ratio and Regression Estimators With Their Classical Counterparts”. Pakistan Journal of Statistics and Operation Research 2, no. 1 (January 1, 2006): 63-68. Accessed March 3, 2026. https://pjsor.com/pjsor/article/view/88.