Zyryanov, Sergey V, and Sergey A Egorov. “Status of the harbour seal (<i>Phoca vitulina</i>) along the Murman coast of Russia”. NAMMCO Scientific Publications 8 (September 1, 2010): 37–46. Accessed March 29, 2024. https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2670.