Zheleva-Dimitrova, D. ., Zhelev, I. . and Dimitrova-Dyulgerova, I. . (2020) “Antioxidant Activity of Some Carduus Species Growing in Bulgaria”, Free Radicals and Antioxidants, 1(4), pp. 15–20. doi: 10.5530/ax.2011.4.4.