Staffan Bensch, Dennis Hasselquist, Territory Infidelity in the Polygynous Great Reed Warbler Acrocephalus arundinaceus: The Effect of Variation in Territory Attractiveness, Journal of Animal Ecology, Vol. 60, No. 3 (Oct., 1991), pp. 857-871
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Bensch et al. (1991) studied this question.
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