Siritheerasas, P., K. Bunyakiat, and S. Osuwan. “Emission of Sulphur Dioxide During Coal Briquette Burning in a Thai Traditional Cooking Stove”. Science & Technology Asia, vol. 5, no. 2, Nov. 2015, pp. 34-42, https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/41914.