Boonpeng, Poonyasiri, Krisda Yingkayun, Uten Boonliam, and Chawaroj Jaisin. “Development of Carbon Dioxide Concentration Control System for an Air-Conditioned Room”. Science and Engineering Connect 45, no. 2 (June 30, 2022): 215–233. accessed June 30, 2025. https://ph04.tci-thaijo.org/index.php/SEC/article/view/10281.