Ponkaew, C., and N. 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, vol. 24, no. 3, Feb. 2024, p. e0258414, doi:10.55003/cast.2024.258414.