Sanaullah, Aamir, Hina Khan, Humera Ameer Ali, and Rajesh Singh. “IMPROVED EXPONENTIAL RATIO-TYPE ESTIMATORS IN SURVEY SAMPLING”. Journal of Reliability and Statistical Studies 5, no. 02 (December 3, 2012): 119–132. Accessed April 30, 2026. https://journals.riverpublishers.com/index.php/JRSS/article/view/21921.