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Essien , G. E.; Thomas , P. S.; Udoette, . I. M. In Vitro Antioxidant Analysis and Quantitative Determination of Phenolic and Flavonoid Contents of Emilia Sonchifolia (L) D.C (Asteraceae) Leaf Extract and Fractions. GSC Biol. Pharm. Sci. 2020, 11, 044-052.