HIBY, Lex; LUNDBERG, Torkel; KARLSSON, Olle; WATKINS, John; JÜSSI, Mart; JÜSSI, Ivar; HELANDER, Björn. Estimates of the size of the Baltic grey seal population based on photo-identification data. NAMMCO Scientific Publications, Tromsø, Norway, v. 6, p. 163–175, 2007. DOI: 10.7557/3.2731. Disponível em: https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2731. Acesso em: 21 apr. 2026.