Falldorf, Tobias, and Olav Strand. “Spatial and Temporal Variations in Lichen Forage Biomass As Estimated from LANDSAT 5 Satellite Images”. Rangifer 31, no. 2 (September 1, 2011): 152. Accessed December 9, 2019. https://septentrio.uit.no/index.php/rangifer/article/view/2003.