Tailor, Rajesh, Sunil Chouhan, Ritesh Tailor, and Neha Garg. “A Ratio-Cum-Product Estimator of Population Mean in Stratified Random Sampling Using Two Auxiliary Variables”. Statistica 72, no. 3 (January 1, 2012): 287–297. Accessed January 27, 2023. https://rivista-statistica.unibo.it/article/view/3648.