“Identification Of Selected Polyphenols In The Leaves Of Purple Coneflower (Echinacea Purpurea)”, Divers. res. j. analysis trends, vol. 3, no. 05, pp. 1–6, Apr. 2025, Accessed: May 04, 2026. [Online]. Available: https://mail.academiaone.org/index.php/2/article/view/1178