Dr. Sanjib Choudhury, Bhupendra Kumar Singh. An Efficient Class of Ratio-Cum-Dual to Product Estimator of Finite Population Mean in Sample Surveys. GJSFR [Internet]. 2012 Oct. 15 [cited 2024 May 5];12(F12):1-11. Available from: https://journalofscience.org/index.php/GJSFR/article/view/669