HEIDE-JØRGENSEN, Mads Peter; LYDERSEN, Christian. Introduction- Ringed seals in the North Atlantic. NAMMCO Scientific Publications, Tromsø, Norway, v. 1, p. 5–8, 1998. DOI: 10.7557/3.2978. Disponível em: https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2978. Acesso em: 18 apr. 2026.