Aagnes, T.H., and S.D. Mathiesen. “Food and snow intake, body mass and rumen function in reindeer fed lichen and subsequently starved for 4 days”. Rangifer 14, no. 1 (December 1, 1994): 33–37. Accessed April 18, 2025. https://new.eludamos.org/index.php/rangifer/article/view/1131.