Belikov, Stanislav E, and Andrei N Boltunov. ‚ÄúDistribution and Migrations of Cetaceans in the Russian Arctic According to Observations from Aerial Ice Reconnaissance‚ÄĚ. NAMMCO Scientific Publications 40 (July 21, 2002): 69-86. Accessed May 16, 2021. https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2838.