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Essential oil composition of Foeniculum vulgare Mill. fruits from pharmacies in different countriesRaal, Ain; Orav, Anne; Arak, ElmarNatural product research2012 / p. 1173-1178 https://www.tandfonline.com/doi/full/10.1080/14786419.2010.535154

Essential oil content and composition in commercial Achillea millefolium L. herbs from different countriesRaal, Ain; Orav, Anne; Arak, ElmarJournal of essential oil bearing plants2012 / p. 22-31 https://www.academia.edu/56949794/Essential_Oil_Content_and_Composition_in_Commercial_Achillea_millefolium_L_Herbs_from_Different_Countries

The content and composition of the essential oil found in Carum carvi L. commercial fruits obtained from different countriesRaal, Ain; Arak, Elmar; Orav, AnneThe journal of essential oil research2012 / p. 53-59 https://www.tandfonline.com/doi/pdf/10.1080/10412905.2012.646016