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Comparison of Spectrophotometric Methods of Total Flavonoid Assay Based on Complex Formation with Aluminum Chloride as Applied to Multicomponent Herbal Drug Angionorm. Journal of Pharmaceutical Negative Results [Internet]. 2018 Jan. 29 [cited 2026 Jun. 19];9(1):1-7. Available from: https://pnrjournal.com/index.php/home/article/view/119