Eriksson, Olof, Mats Sandewall, and Erik Wilhelmsson. “A Model for Analyzing Influence of Timber Production on Lichens for Reindeer Grazing”. Rangifer 7, no. 2 (June 1, 1987): 15–32. Accessed August 20, 2022. https://septentrio.uit.no/index.php/rangifer/article/view/712.