1. Bass, J. (2000). Variations in gray whale feeding behavior in the presence of whale-watching vessels in Clayoquot Sound, 1993’995. Ph.D. dissertation, Victoria, BC: Department of Geography, University of Victoria.
2. Baumgartner, M. F., Cole, T. V. N., Campbell, R. G., Teegargen, G. J., & Durbin, E. G. (2003). Associations between North Atlantic right whales and their prey, Calanus finmarchicus, over diel and tidal time scales. Marine Ecology Progress Series, 264, 155’66.
3. Berzin, A. A., Vladimirov, V. L., & Doroshenko, N. V. (1988). Results of aerial surveys to study the distribution and abundance of cetaceans in the coastal waters of the Sea of Okhotsk in 1986’987. In N. S. Chernysheva (Ed.), All-Union Scientific Research Institute of Fisheries and Oceanography (VNIRO) (pp. 18’5). Moscow, USSR: VNIRO (in Russian).
4. Berzin, A. A., Vladimirov, V. L., & Doroshenko, N. V. (1990). Aerial surveys to determine the distribution and number of polar gray whales and beluga whales in the Sea of Okhotsk in 1985’989. Izvestiya Tikhookeanskogo Nauchno–Issledovatel’skogo Instituta Rybnogo Khozyaistva I Okeanografii (TINRO), 112, 51’0 (in Russian).
5. Berzin, A. A., Vladimirov, V. L., & Doroshenko, N. V. (1991). Results of aerial surveys to study the distribution and abundance of whales in the Sea of Okhotsk in 1988’990. In L. A. Popov (Ed.), All-union scientific research institute of fisheries and oceanography (VNIRO) (pp. 6’7). Moscow, Russia (in Russian).