Rauno V. Alatalo, Multidimensional Foraging Niche Organization of Foliage-Gleaning Birds in Northern Finland, Ornis Scandinavica (Scandinavian Journal of Ornithology), Vol. 13, No. 1 (Apr., 1982), pp. 56-71
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Rauno V. Alatalo (1982) studied this question.
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