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Ewart, J. C., 1894, The development of the skeleton of the limbs of the horses, with observations on polydactyly: Journal of Anatomy and Physiology, v. 28, p. 342-369.
MacFadden, B. J., 1976, Cladistic analysis of primitive equids, with notes on other perissodactyls: Systematic Zoology, v. 25, p. 1-15.
Simpson, G. G., 1951, Horses: Oxford, Oxford University Press, 323 p.
Struthers, J., 1893, On the development of the bones of the foot of the horse, and of digital bones generally and on a case of polydactyly in the horse: Journal of Anatomy and Physiology, v. 28, p. 51-62.
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