Bergerud, Arthur T., and Stuart N. Luttich. “Predation Risk and Optimal Foraging Trade-off in the Demography and Spacing of the George River Herd, 1958 to 1993”. Rangifer 23, no. 5 (April 1, 2003): 169–191. Accessed July 26, 2026. https://septentrio.uit.no/index.php/rangifer/article/view/1699.