Thong-Innatra, K., Theeraraj, G., Yuwaree, C., Charmondusit, K., & Hutacharoen, R. (2017). A Study of Biodiesel (Ethyl Ester) Production from Grease/Oil Rich Sludge through Acid-Catalytic Ethanol Transesterification and It’s Fuel Specifications. Environment and Natural Resources Journal, 8(2), 31–46. Retrieved from https://ph02.tci-thaijo.org/index.php/ennrj/article/view/82555