Nilssen, Kjell Tormod, and Tore Haug. “Status of Grey Seals (Halichoerus Grypus) in Norway”. NAMMCO Scientific Publications 6 (January 1, 2007): 23–31. Accessed July 23, 2026. https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2719.