Ropstad, E., D. Lenvik, E. Bø, M. M. Fjellheim, and K. B. Romsås. “Ovarian Function and Pregnancy Rates in Reindeer Calves [Rangifer Tarandus) in Southern Norway”. Rangifer 10, no. 5 (September 1, 1990): 31. Accessed September 30, 2020. https://septentrio.uit.no/index.php/rangifer/article/view/954.