Nieminen, Mauri, Ulla Heiskari, and Timo Soveri. “Use of Urine Samples Collected from Bladder and Snow to Indicate Condition of Semi-Domesticated Reindeer”. Rangifer 10, no. 4 (September 1, 1990): 53–54. Accessed May 17, 2022. https://septentrio.uit.no/index.php/rangifer/article/view/918.