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Tore Slagsvold, Competition between the Great Tit Parus major and the Pied Flycatcher Ficedula hypoleuca: An Experiment, Ornis Scandinavica (Scandinavian Journal of Ornithology), Vol. 9, No. 1 (1978), pp. 46-50
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Tore Slagsvold (1978) studied this question.
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