Kumar Gangele, Raj, Gajendra Kumar Vishwakarma, and Shailesh Kumar Choubey. 2022. “An Efficient Class on Linear Combination of Ratio Type Estimators for Estimating the Population Mean”. Thailand Statistician 20 (2):284-92. https://ph02.tci-thaijo.org/index.php/thaistat/article/view/246341.