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Determination of Total Flavonoid Content of Wood Extract Raru (Cotylelobium Lanceolatum Craib ) Based on Differences in Ethanol Concentration With Uv-Vis Spectrophotometry Methods. JPS 2023, 6 (4), 1804-1810. https://doi.org/10.36490/journal-jps.com.v6i4.305.