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Square-Wave Voltammetric Determination of Rutin in Pharmaceutical Formulations Using a Carbon Composite Electrode Modified With Copper (II) Phosphate Immobilized in Polyester Resin . Braz. J. Pharm. Sci. 2012, 48 (4), 639-649. https://doi.org/10.1590/S1984-82502012000400007.