Wongkiraprat, S., P. Panitcharoen, and W. Tangwongcharoen. “Smart Phone Application for Estimating Smoke Level”. Journal of Advanced Development in Engineering and Science, vol. 8, no. 22, Aug. 2023, pp. 53-62, https://ph03.tci-thaijo.org/index.php/pitjournal/article/view/902.