Pulliainen, E., P. I. Danilov, K. Heikura, E. Erkinaro, S. Sulkava, and E. Lindgren. “The familiar area hypothesis and movement patterns of wild forest reindeer in Karelia, Northern Europe”. Rangifer, vol. 6, no. 2, June 1986, pp. 235-40, doi:10.7557/2.6.2.652.