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2021. Optimization of Ultrasonic Assisted Extraction Process on Antioxidant Activity of Honje Fruit Extract (Etlingera elatior) Using Surface Response Method. Jurnal Kimia Valensi. 7, 2 (Nov. 2021), 118–128. DOI:https://doi.org/10.15408/jkv.v7i2.21396.