Subzar, M. ., S. . Maqbool, M. R. . Verma, and T. A. . Raja. “AN IMPROVED CLASS OF RATIO ESTIMATORS FOR ESTIMATING POPULATION MEAN USING AUXILIARY INFORMATION IN SURVEY SAMPLING”. Journal of Reliability and Statistical Studies, vol. 10, no. 02, Dec. 2017, pp. 65-82, https://journals.riverpublishers.com/index.php/JRSS/article/view/20941.