J. E. Colman, S. Storlien, S. R. Moe, Ø. Holand, and E. Reimers, “Reindeer avoidance of pasture contaminated with sheep and reindeer faeces”, Ran, vol. 23, no. 5, pp. 313–320, Apr. 2003, doi: 10.7557/2.23.5.1716.