Reference

Sheila H. Luijten, J. Gerard B. Oostermeijer, Nico C. van Leeuwen, Hans C. M. Den Nijs (1996): Reproductive success and clonal genetic structure of the rare Arnica montana (Compositae) in The Netherlands – Österreichische Botanische Zeitschrift = Plant Systematics and Evolution – 201 : 15 - 30.