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2023. Optimization of Extraction Solvent for Analysis of Total Phenolic and Antioxidant Activity of Guava Leaves (Psidium guajava) using Simplex Centroid Design. Jurnal Jamu Indonesia. 8, 3 (Dec. 2023), 90–96. DOI:https://doi.org/10.29244/jji.v8i3.344.