NILSSEN, Kjell Tormod; HAUG, Tore. Status of grey seals (Halichoerus grypus) in Norway. NAMMCO Scientific Publications, Tromsø, Norway, v. 6, p. 23–31, 2007. DOI: 10.7557/3.2719. Disponível em: https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2719. Acesso em: 18 may. 2026.