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Sooktawee, S.; Ketwang, R.; Patpai, A.; Piemyai, N. A Study on Determining the Potential Source Area of PM2.5 Using Bivariate Polar Plot Technique on Short-Term Monitoring Data in Bhan Phi District, Khonkhen Province, Thailand. J Appl Res Sci Tech 2022, 21, 66-78.