Wattana, A. ., Watanawanyoo, P. . and Nirukkanaporn, S. . (2020) “A study on thermal efficiency of downdraft gasifier (swirl air type)”, Journal of Current Science and Technology, 10(2), pp. 203–215. available at: https://ph04.tci-thaijo.org/index.php/JCST/article/view/397 (accessed: 3 June 2025).