Bhushan, S. ., R. K. . Singh, and S. . Katara. “IMPROVED ESTIMATION UNDER MIDZUNO – LAHIRI – SEN TYPE SAMPLING SCHEME”. Journal of Reliability and Statistical Studies, vol. 2, no. 2, Dec. 2009, pp. 59-66, https://journals.riverpublishers.com/index.php/JRSS/article/view/22067.