Gould, S. J., Raup, D. M., Sepkoski, J. J., Schopf, T. J. M., and Simberloff, D. S., 1977, The shape of evolution: A comparison of real and random clades: Paleobiology, v. 3, p. 23-40.
MacFadden, B. J., 1976, Cladistic analysis of primitive equids, with notes on other perissodactyls: Systematic Zoology, v. 25, p. 1-15.
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