Holmstad, P. R., Ø. Holstad, G. Karbøl, J. O. Revhaug, E. Schei, V. Vandvik, and A. Skorping. 2004. “Parasite Tags in Ecological Studies of Terrestrial Hosts: A Study on Ptarmigan (Lagopus spp.) Dispersal”. Ornis Fennica 81 (3):128–136. https://ornisfennica.journal.fi/article/view/133620.