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Determination of Total Phenolic Content of Ethanol Extract, Ethyl Acetate and N-Hexan Fraction of Robusta Coffee Leaves (Coffea Canephora Pierre Ex A. Froehner) Using Uv-Vis Spectrofotometry Method. JPS 2023, 6 (4), 1709-1716. https://doi.org/10.36490/journal-jps.com.v6i4.301.