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 April 25, 2024. https://septentrio.uit.no/index.php/rangifer/article/view/395.