LYDERSEN, Christian. Status and biology of ringed seals (Phoca hispida) in Svalbard. NAMMCO Scientific Publications, Tromsø, Norway, v. 1, p. 46–62, 1998. DOI: 10.7557/3.2980. Disponível em: https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2980. Acesso em: 3 may. 2026.