Singh, Housila P., Prem Chandra, and Sarjinder Singh. “Variance Estimation Using Multiauxiliary Information for Random Non-Response in Survey Sampling”. Statistica 63, no. 1 (January 1, 2003): 23–40. Accessed November 23, 2024. https://rivista-statistica.unibo.it/article/view/1306.