Chaudhary, Manoj Kumar, Amit Kumar, and Gautam K. Vishwakarma. “Some Improved Estimators of Population Mean Using Two-Phase Sampling Scheme in the Presence of Non-Response”. Pakistan Journal of Statistics and Operation Research 17, no. 4 (December 1, 2021): 911-919. Accessed November 3, 2024. https://pjsor.com/pjsor/article/view/2505.