Wattana, A. ., P. . Watanawanyoo, and S. . Nirukkanaporn. “A Study on Thermal Efficiency of Downdraft Gasifier (swirl Air Type)”. Journal of Current Science and Technology, vol. 10, no. 2, Feb. 2023, pp. 203-15, https://ph04.tci-thaijo.org/index.php/JCST/article/view/397.