Hans Temrin, Ylva Mallner, , Observations on Polyterritoriality and Singing Behaviour in the Wood Warbler Phylloscopus sibilatrix, Ornis Scandinavica (Scandinavian Journal of Ornithology), Vol. 15, No. 1 (May, 1984), pp. 67-72
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Temrin et al. (1984) studied this question.
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