HÄRKÖNEN, Tero; STENMAN, Olavi; JÜSSI, Mart; JÜSSI, Ivar; SAGITOV, Roustam; VEREVKIN, Michail. Population size and distribution of the Baltic ringed seal (Phoca hispida botnica). NAMMCO Scientific Publications, Tromsø, Norway, v. 1, p. 167–180, 1998. DOI: 10.7557/3.2986. Disponível em: https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2986. Acesso em: 21 apr. 2026.