Nguyen, . V. L., and . M. C. Hsiao. “Preparation of Biodiesel Synthesis from Cooked Oil Waste Catalyzed by Sodium Hydrate and Microwave”. Journal of Technical Education Science, vol. 10, no. 4, Dec. 2015, pp. 66-74, https://www.jte.edu.vn/index.php/jte/article/view/1032.