Ponkaew C, Lawson N. New Product Estimators for Population Mean Under Unequal Probability Sampling with Missing Data: A Case Study on the Number of New COVID-19 Patients. Thail. Stat. [internet]. 2024 Jun. 29 [cited 2026 Sep. 14];22(3):634-56. available from: https://ph02.tci-thaijo.org/index.php/thaistat/article/view/254773