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R. Langvatn, S.D. Albon, T. Burkey, T.H. Clutton-Brock, Climate, Plant Phenology and Variation in Age of First Reproduction in a Temperate Herbivore, Journal of Animal Ecology, Vol. 65, No. 5 (Sep., 1996), pp. 653-670
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Langvatn et al. (1996) studied this question.
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