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Tore Slagsvold, Competition between the Great Tit Parus major and the Pied Flycatcher Ficedula hypoleuca in the Breeding Season, Ornis Scandinavica (Scandinavian Journal of Ornithology), Vol. 6, No. 2 (1975), pp. 179-190
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Tore Slagsvold (1975) studied this question.
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