Jack W. Lentfer, Richard J. Hensel, James R. Gilbert, Fred E. Sorensen, Population Characteristics of Alaskan Polar Bears, Bears: Their Biology and Management, Vol. 4, A Selection of Papers from the Fourth International Conference on Bear Research and Management, Kalispell, Montana, USA, February 1977 (1980), pp. 109-115
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Lentfer et al. (1980) studied this question.
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