Christer G. Wiklund, Jimmy Stigh, Nest Defence and Evolution of Reversed Sexual Size Dimorphism in Snowy Owls Nyctea scandiaca, Ornis Scandinavica (Scandinavian Journal of Ornithology), Vol. 14, No. 1 (Mar., 1983), pp. 58-62
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Wiklund et al. (1983) studied this question.
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