N. Gjoncaj

Yarrow (Achillea millefolium L. s.l.): pharmaceutical quality of commercial samples.

B. Kopp, G. Reznicek, E. Rozema, 2008, Die Pharmazie.

Distribution of Phenolic Compounds in Middleeuropean Taxa of the Achillea millefolium L. Aggregate

B. Kopp, J. Saukel, B. Benedek, 2007, Chemistry & biodiversity.