Ryg, Morten, and Endre Jacobsen. “Effects of Nutrition on Serum Levels of Thyroxine and Triiodothyronine in Reindeer (Rangifer Tarandus Tarandus)”. Rangifer 1, no. 1 (May 1, 1981): 4–9. Accessed July 1, 2022. https://septentrio.uit.no/index.php/rangifer/article/view/395.