P. R. Evans, N. C. Davidson, J. D. Uttley, R. D. Evans, Premigratory Hypertrophy of Flight Muscles: An Ultrastructural Study, 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. 238-243
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Evans et al. (1992) studied this question.
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