แสนหาญ T. S., Januson Dikae, and Chaiyaporn Panyindee. “Small Low-Cost Air Purifier Controlled by an Android Smartphone”. NBTC Journal, vol. 5, no. 5, Nov. 2021, pp. 319-33, https://so04.tci-thaijo.org/index.php/NBTC_Journal/article/view/240836.