Moen, R., Olsen, M. A., Haga, Ø. E., Sørmo, W., Aagnes Utsi, T. H. and Mathiesen, S. D. (1998) “Digestion of timothy silage and hay in reindeer”, Rangifer, 18(1), pp. 35-45. doi: 10.7557/2.18.1.1444.