VAN OORT, B. E.H.; TYLER, N. J.C.; REIERTH, E.; STOKKAN, K.-A. Biological rhythms in Arctic vertebrates. Rangifer, Tromsø, Norway, v. 20, n. 2-3, p. 99–112, 2000. DOI: 10.7557/2.20.2-3.1506. Disponível em: https://septentrio.uit.no/index.php/rangifer/article/view/1506. Acesso em: 18 may. 2026.