Conny Askenmo, Uno Unger, How to Be Double-Brooded: Trends and Timing of Breeding Performance in the Rock Pipit, Ornis Scandinavica (Scandinavian Journal of Ornithology), Vol. 17, No. 3 (Jul., 1986), pp. 237-244
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Askenmo et al. (1986) studied this question.
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