Hebblewhite, M., J. Whittington, M. Bradley, G. Skinner, A. Dibb, and C. A. White. “Conditions for caribou persistence in the wolf-elk-caribou systems of the Canadian Rockies”. Rangifer, vol. 27, no. 4, Apr. 2007, pp. 79-91, doi:10.7557/2.27.4.322.