Singh, V. K. ., and R. . Singh. “SOME IMPROVED SUGGESTIONS IN CIRCULAR SYSTEMATIC SAMPLING UNDER FULLY AND PARTIALLY RESPONDENT CASE”. Journal of Reliability and Statistical Studies, vol. 8, no. 01, June 2015, pp. 115-34, https://journals.riverpublishers.com/index.php/JRSS/article/view/21091.