Trendafilova, Antoaneta, Victoria Ivanova, Milka Todorova, Plamena Staleva, and Ina Aneva. 2021. “Terpenoids in Four Inula Species from Bulgaria: Scientific Paper”. Journal of the Serbian Chemical Society 86 (12). Belgrade, Serbia:1229-40. https://doi.org/10.2298/JSC210730087T.