Ponkaew, Chugiat, and Nuanpan Lawson. “New Ratio Estimators for Population Mean under Unequal Probability Sampling Without Replacement in the Presence of Missing Data: A Case Study on Fine Particulate Matter in Bangkok, Thailand”. CURRENT APPLIED SCIENCE AND TECHNOLOGY 24, no. 3 (February 15, 2024): e0258414. accessed August 27, 2026. https://li01.tci-thaijo.org/index.php/cast/article/view/258414.