Singh, Housila P., Ritesh Tailor, and Rajesh Tailor. “Estimation of Finite Population Mean in Two-Phase Sampling With Known Coefficient of Variation of an Auxiliary Character”. Statistica 72, no. 1 (January 1, 2012): 111–126. Accessed December 26, 2024. https://rivista-statistica.unibo.it/article/view/3637.