Natthapat Thongsak และ Nuanpan Lawson. (2022) Classes of combined population mean estimators utilizing transformedvariables under double sampling with application to air pollutionin Chiang Rai, Thailand. <i>Songklanakarin Journal of Science an Technology (SJST)</i>, <i>44</i>(5), 1390-1398.Natthapat Thongsak และ Nuanpan Lawson. "Classes of combined population mean estimators utilizing transformedvariables under double sampling with application to air pollutionin Chiang Rai, Thailand". Songklanakarin Journal of Science an Technology (SJST) 44 (2022):1390-1398.Natthapat Thongsak และ Nuanpan Lawson. Classes of combined population mean estimators utilizing transformedvariables under double sampling with application to air pollutionin Chiang Rai, Thailand. Research and Development Office, Prince of Songkla University:ม.ป.ท. 2022.