• Chemical investigation of the essential oil from berries and needles of common juniper (Juniperus communis L.) growing wild in EstoniaOrav, Anne; Kailas, Tiiu; Müürisepp, Aleksander-MatiNatural product research2010 / 19, p. 1789-1799
• Composition of the essential oil of Salvia officinalis L. from various European countriesRaal, Ain; Orav, Anne; Arak, ElmarNatural product research2007 / 5, p. 406-411
• Composition of the essential oil of the Rhododendron tomentosum Harmaja from EstoniaRaal, Ain; Orav, Anne; Gretšušnikova, TatjanaNatural product research2014 / p. 1091-1098 : tab https://doi.org/10.1080/14786419.2014.907287 https://www.scopus.com/sourceid/24819 https://www.scopus.com/record/display.uri?eid=2-s2.0-84903774016&origin=inward&txGid=dfea79c3e1cc65d17dab9f0d91f810be https://jcr.clarivate.com/jcr-jp/journal-profile?journal=NAT%20PROD%20RES&year=2014 https://www.webofscience.com/wos/woscc/full-record/WOS:000338988600010
• Content and composition of the essential oil of Chamomilla recutita (L.)Rauschert from some European countriesOrav, Anne; Raal, Ain; Arak, ElmarNatural product research2010 / 1, p. 48-55
• 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 composition of Pimpinella anisum L. fruits from various European countriesOrav, Anne; Raal, Ain; Arak, ElmarNatural product research2008 / 3, p. 227-232 https://www.researchgate.net/publication/5586276_Essential_oil_composition_of_Pimpinella_anisum_L_fruits_from_various_European_countries
• Phytochemical analysis of the essential oil of Achillea millefolium L. from various European countriesOrav, Anne; Arak, Elmar; Raal, AinNatural product research2006 / 12, p. 1082-1088
• Phytochemical analysis of the essential oil of Thymus serpyllum L. growing wild in EstoniaPaaver, Urve; Orav, Anne; Arak, Elmar; Mäeorg, Uno; Raal, AinNatural product research2008 / 2, p. 108-115
• Variation in the composition of the essential oils, phenolic compounds and mineral elements of Hypericum perforatum L. growing in EstoniaHelmja, Kati; Vaher, Merike; Püssa, Tõnu; Orav, Anne; Viitak, Anu; Levandi, Tuuli; Kaljurand, MihkelNatural product research2011 / p. 496-510