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William R. Dawson, Cynthia Carey, Thomas J. Van't Hof, Metabolic Aspects of Shivering Thermogenesis in Passerines during Winter, Ornis Scandinavica (Scandinavian Journal of Ornithology), Vol. 23, No. 3, Proceedings of the Symposium Hormones, Physiology and Non-Reproductive Behaviour in Birds, 21-23 August, 1991, Göteborg, Sweden (Jul. - Sep., 1992), pp. 381-387
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Dawson et al. (1992) studied this question.
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