Srisongkham, Suriyan, and Chonlatee Photong. “Ion Balance Measuring and Recording System for Air Ionizers: doi: 10.14456/mijet.2021.6”. Engineering Access 7, no. 1 (December 14, 2020): 36–42. accessed August 27, 2026. https://ph02.tci-thaijo.org/index.php/mijet/article/view/10.14456.mijet.2021.6.