Kjell Larsson, , Lars Gustafsson, Barwolt S. Ebbinge, From the High Arctic to the Baltic: The Successful Establishment of a Barnacle Goose Branta leucopsis Population on Gotland, Sweden, Ornis Scandinavica (Scandinavian Journal of Ornithology), Vol. 19, No. 3 (Sep., 1988), pp. 182-189
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Larsson et al. (1988) studied this question.
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