Eileen Zerba, Martin L. Morton, The Rhythm of Incubation from Egg Laying to Hatching in Mountain White-Crowned Sparrows, Ornis Scandinavica (Scandinavian Journal of Ornithology), Vol. 14, No. 3 (Sep., 1983), pp. 188-197
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Zerba et al. (1983) studied this question.
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