ZIRYANOV, Sergej V; MISHIN, Vasily L. Grey seals on the Murman coast, Russia: status and present knowledge. NAMMCO Scientific Publications, Tromsø, Norway, v. 6, p. 13–21, 2007. DOI: 10.7557/3.2718. Disponível em: https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2718. Acesso em: 2 may. 2026.