Ö, E.-D. ., P. M, B. M, A.-P. A, and A. . N. “Total Phenolic Contents, Antioxidant Activities and Cytotoxicity of Three Centaurea Species: C. Calcitrapa Subsp. Calcitrapa, C. Ptosimopappa and C. Spicata”. Free Radicals and Antioxidants, vol. 1, no. 2, Dec. 2020, pp. 31-36, doi:10.5530/ax.2011.2.7.