Misra, G. C. ., S. K. . Yadav, A. K. . Shukla, and R. . Bahadur. “USE OF A NON-LINEAR MODEL FOR IMPROVED ESTIMATION IN CLUSTER SAMPLING”. Journal of Reliability and Statistical Studies, vol. 3, no. 02, Dec. 2010, pp. 73-78, https://journals.riverpublishers.com/index.php/JRSS/article/view/22011.