Attygalle, A., Meinwald, J., Eisner, M. & Eisner, T., 2001: Attractive and defensive functions of the ultraviolet pigments of a flower ( Hypericum calycinum ). PNAS 98(24): 13745–13750. Hess, D., 1991: [...] Kobayashi, K., Syafaruddin, Niikura, S., Ninomiya, S. & Ohsawa, R., 2005: Intraspecific variation in the ultraviolet colour proportion of flowers in Brassica rapa L. Plant Breeding 124: 551–556. Text: Annika
https://www.garten.uni-rostock.de/studium-und-lehre/vertiefung-ausgewaehlter-themen/uv-strahlung-und-pflanze/