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Simpen, Nengah, Winaya, IN. Suprapta, Subagia, ID.G. Ary, AND Suyasa, IW. Budiarsa. " Solid Catalyst in Esterification and Transesterification Reactions for Biodiesel Production: A Review" International Journal of Engineering and Emerging Technology [Online], Volume 5 Number 2 (15 December 2020)