Yadav, Rohini, Lakshmi N. Upadhyaya, Housila P. Singh, and S. Chatterjee. “A Chain Ratio Exponential Type Estimator in Two-Phase Sampling Using Auxiliary Information”. Statistica 73, no. 2 (January 1, 2013): 221–234. Accessed November 24, 2024. https://rivista-statistica.unibo.it/article/view/4133.