SoveriT., HelynrantaE., NieminenM., YliseläE., and LindbergL. A. “Histological Changes in Rumen Epithelium of Reindeer Calves During the Winter Season”. Rangifer 10, no. 3 (September 1, 1990): 397. Accessed June 2, 2020. https://septentrio.uit.no/index.php/rangifer/article/view/886.