Wilken & Hannah 2002b
Aus Offene Naturführer
Wilken, D. & Hannah, L. 2002: Filago gallica L. (Asteraceae) – Narrow-leaved Filago. (http://usgssrv1.usgs.nau.edu/swepic/factsheets/Filago_gallica.pdf).
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Werkzeugbox für Autoren