Cekim, H. O. ., and C. . Kadilar. “GENERALIZED FAMILY OF ESTIMATORS VIA TWO AUXILIARY VARIABLES FOR POPULATION VARIANCE”. Journal of Reliability and Statistical Studies, vol. 11, no. 01, June 2018, pp. 67-81, https://journals.riverpublishers.com/index.php/JRSS/article/view/20903.