1. Flåøyen A, Frøslie A. Photosensitization disorders. In: D’Mello JPF, editor. Handbook of plant and fungal toxicants. New York: CRC Press; 1997. p. 191–204.
2. Mysterud I, Vang M, Nortvedt S. Lammedødelighet 2001 og tapssituasjon 1999–2001 i et alveld-område i Halsa/Surnadal, Møre og Romsdal Med en oversikt over hypoteser i alveldforskningen. Utmarksnæring i Norge 2003; 1:1–127.
3. Ford EJH. A preliminary investigation of photosensitization in Scottish sheep. J Comp Pathol 1964;74:37–44.
4. Flåøyen A. Plant-associated hepatogenous photosensitization diseases. In: Tu AT, Gaffield W, editors. Natural and selected synthetic toxins. Biological implications. Washington: American Chemical Society Symposium Series 745; 2000. p. 204–19.
5. Stabursvik A. A phytochemical study of Narthecium ossifragum (L.) Huds. Norges Tekniske Vitenskapsakademi, Series 2, No. 6, NTH-trykk, Oslo University Press, 1959.