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Wardana, Dian, et al. “The Effect of Methanol Flow Rate and Repeated Use on Amberlyst Catalyst Characteristics in Palm Fatty Acid Distillate (PFAD) Esterification Reaction”. Jurnal Pendidikan Kimia, vol. 15, no. 2, Aug. 2023, pp. 155-62, doi:10.24114/jpkim.v15i2.43668.