Coexistence and Competition between Overwintering Willow Warblers Phylloscopus trochilus and Local Warblers at Lake Naivasha, Kenya, Ornis Scandinavica (Scandinavian Journal of Ornithology), Vol. 18, No. 2 (May, 1987), pp. 101-121
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Jørgen Rabøl (1987) studied this question.
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