Ponkaew, Chugiat, and Nuanpan Lawson. “New Variance Estimators in the Presence of Nonresponse Under Unequal Probability Sampling, With Application to Fine Particulate Matter in Thailand”. Thailand Statistician 22, no. 1 (December 28, 2023): 76–101. Accessed May 9, 2024. https://ph02.tci-thaijo.org/index.php/thaistat/article/view/252224.