BELIKOV, Stanislav E; BOLTUNOV, Andrei N. The ringed seal (Phoca hispida) in the western Russian Arctic. NAMMCO Scientific Publications, Tromsø, Norway, v. 1, p. 63–82, 1998. DOI: 10.7557/3.2981. Disponível em: https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2981. Acesso em: 18 apr. 2026.