ZIRYANOV, S. V.; MISHIN, V. L. Grey seals on the Murman coast, Russia: status and present knowledge. NAMMCO Scientific Publications, [S. l.], 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: 21 sep. 2021.