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“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”, Pharmasci, vol. 6, no. 2, pp. 89–97, Jul. 2021, doi: 10.53342/pharmasci.v6i2.224.