Théau, Jérôme, and Claude R. Duguay. “Mapping Lichen Changes in the Summer Range of the George River Caribou Herd (Québec-Labrador, Canada) Using Landsat Imagery (1976-1998)”. Rangifer, vol. 24, no. 1, Apr. 2004, pp. 31-50, https://doi.org/10.7557/2.24.1.299.