Mishra, P. ., P. . Singh, and R. . Singh. “A GENERALIZED CLASS OF ESTIMATORS FOR ESTIMATING POPULATION MEAN USING IMPUTATION TECHNIQUE”. Journal of Reliability and Statistical Studies, vol. 10, no. 02, Oct. 2017, pp. 33-41, https://journals.riverpublishers.com/index.php/JRSS/article/view/20937.