Anderson, John R., and Arne C. Nilssen. “Do Reindeer Aggregate on Snow Patches to Reduce Harassment by Parasitic Flies or to Thermoregulate?”. Rangifer 18, no. 1 (February 1, 1998): 3-17. Accessed September 25, 2020. https://septentrio.uit.no/index.php/rangifer/article/view/1369.