Srivastava, Namita, and Ruchi Shakya. “Calibration Estimation in Stratified Random Sampling Using Three Constraints”. Global Journal of Mathematics and Statistics 3, no. 1 (July 8, 2026): 10–18. Accessed July 15, 2026. https://bluemarkpublishers.com/index.php/GJME/article/view/930.