References
- Amstrup, S. C. & DeMaster, D. P. 1988: Polar bears. Pp. 39-56 in Lentfer, J. W. ( ed.): Selected marine mammals of Alaska: Species accounts with research and management rec-ommendations. Marine Mammal Commission, Washington.
- Amstrup, S. C., Stirling, I. & Lentfer, J. W. 1986: Past and present status of polar bears in Alaska. Wildl. Soc. Bull. 14, 241–254.
- DeMaster, D. P. & Stirling, I. 1981: Ursus maritimus. Mammalian Species 145, 1–7.
- Bakken, V. & Mehlum, F. 1988: AKUP-sluttrapport. Sjø-fuglundersøkelser nord for 74°N/BjørnOya. Norsk Polarinst. Rapport 44, 1–179.
- Burnham, K. P. & Anderson, D. R. 1984: The need for distance data in transect counts. I. Wildl. Manage. 48, 1248–1254.
- Caughley, G. 1974: Bias in aerial surveys. J. Wildl. Manage. 38, 921–933.
- Larsen, T. 1972: Air and ship census of polar bears in Svalbard. J. Wildl. Manage. 36, 562–570.
- Larsen, T. 1986: Population biology of the polar bear (Units maritimus) in the Svalbard area. Norsk Polarinst. Skr. 184.
- Lørnø, O. 1970: The polar bear in the Svalbard area. Norsk Polarinst. Skr. 129.
- Parovshchikov, V. Ja. 1967: Polar bears in Franz Josef Land. Problems of the North II, 149–159.
- Ramsay, M. A. & Stirling, I. 1986: On the mating system of polar bears. Can. J. Zool. 64, 2142–2151.
- Stirling, I., Andriashek, D. & Calvert, W. 1981: Habitat preferences and distribution of polar bears in the western Canadian Arctic. Report prepared for Dome Petroleum Limited, Esso Resources Canadian Limited, and the Canadian Wildlife Service. Canadian Wildlife Service, Edmonton, Canada.