Kumar Gangele, R. ., G. . Kumar Vishwakarma, and S. . Kumar Choubey. “An Efficient Class on Linear Combination of Ratio Type Estimators for Estimating the Population Mean”. Thailand Statistician, vol. 20, no. 2, Mar. 2022, pp. 284-92, https://ph02.tci-thaijo.org/index.php/thaistat/article/view/246341.