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2021. 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. Journal Pharmasci (Journal of Pharmacy and Science). 6, 2 (Jul. 2021), 89–97. DOI:https://doi.org/10.53342/pharmasci.v6i2.224.