Composition #2: Trendafilova, Antoaneta B., Todorova, Milka N., Evstatieva, Ljuba N., Antonova, Daniela V. Variability in the Essential-Oil Composition of Sideritis scardica Griseb. from Native Bulgarian Populations . chemistry & biodiversity, 2013, vol. 10, no. 3, p. 484–492. DOI: 10.1002/cbdv.201200282.
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