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Predicting Presence of Proazulenes in the Achillea millefolium Group. Barbara Michler and Carl-Gerold Arnold, Folia Geobotanica, Vol. 34, No. 1, Ecology of Closely Related Plant Species. Proceedings of the 40th Symposium of the International Association of Vegetation Science (1999), pages 143–161 (jstor stable URL 5 Eylül 2019 tarihinde Wayback Machine sitesinde arşivlendi.)
