Tittel	Centaurea phrygia subsp. phrygia as a German polemochore in Sør-Varanger, NE Norway, with notes on other taxa of similar origin
Undertittel
Forfattere	Alm, T., Piirainen, M. & Often, A.
År	2009
Kilde	Bot. Jahrb. Syst. 127(4): 417-432.
ISBN, ISSN	0006-8152