Siebert, Ursula, Frances Gulland, Timm Harder, Thierry Jauniaux, Henrike Seibel, Peter Wohlsein, and Wolfgang Baumgärtner. 2010. “Epizootics in harbour seals (Phoca vitulina): clinical aspects”. NAMMCO Scientific Publications 8 (September). Tromsø, Norway:265-74. https://doi.org/10.7557/3.2689.