Belikov, Stanislav E, and Andrei N Boltunov. “Distribution and migrations of cetaceans in the Russian Arctic according to observations from aerial ice reconnaissance”. NAMMCO Scientific Publications 4 (July 21, 2002): 69–86. Accessed April 26, 2024. https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2838.