Katporm, Phongsapat, and Phonpat Hemwan. 2020. “The Prediction of Particulate Matters 2.5 Micron (PM2.5) Concentration using Geographic Weighted Regression Modeling in Nan Province”. Defence Technology Academic Journal 1 (3). Bangkok, Thailand:88-97. https://sc01.tci-thaijo.org/index.php/dtaj/article/view/240530.