Study on Synthesis of Solid Acid Catalyst from Borassus flabellifer L. Waste with Sulfonation Method: Kajian Sintesis Katalis Asam Padat dari Limbah Sabut Siwalan (Borassus flabellifer L.) dengan Metode Sulfonasi. (2021). Journal Pharmasci (Journal of Pharmacy and Science), 6(2), 89-97. https://doi.org/10.53342/pharmasci.v6i2.224