Biesiada A, Sokół-Łętowska A, Kucharska AZ. Antioxidant activity of Calendula officinalis, Arnica chamissonis and Echinacea purpurea as dependent on the part of plant and method of material preparation. Curr. Issues Pharm. Med. Sci. [Internet]. 2025 May 14 [cited 2025 May 21];24(3):147-52. Available from: https://czasopisma.umlub.pl/curipms/article/view/3038