Veleva, R. K.; Moskova-Doumanova, V.; Todorova, M.; Trendafilova, A.; Doumanov, J.; Topouzova-Hristova, T. Cytotoxicity of Flavonoid Glycosides, Flavonoids and Phenolic Acids from Inula Oculus-Christi on Mammalian Cell Lines. J. BioSci. Biotechnol. 2017, 5, 219-224.