S. Gooch, S. R. Baillie, T. R. Birkhead, Magpie Pica pica and Songbird Populations. Retrospective Investigation of Trends in Population Density and Breeding Success, Journal of Applied Ecology, Vol. 28, No. 3 (Dec., 1991), pp. 1068-1086
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Gooch et al. (1991) studied this question.
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