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Simpen, Nengah, IN. Suprapta Winaya, ID.G. Ary Subagia, & IW. Budiarsa Suyasa. " Solid Catalyst in Esterification and Transesterification Reactions for Biodiesel Production: A Review." International Journal of Engineering and Emerging Technology [Online], 5.2 (2020): 168-174. Web. 5 Apr. 2026