Bansal, Mohan Lal, and R. Singh. “An Alternative Estimator for Multiple Characteristics Corresponding to Hurwitz and Thompson Estimator in Probability Replacement Sampling”. Statistica 49, no. 3 (January 1, 1989): 447–452. Accessed May 4, 2024. https://rivista-statistica.unibo.it/article/view/809.