[R] Cracraft
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Cracraft, J. (1983). Species concepts amd spectation analysis. Curr. Ornithol. 1, 159-187
Cracraft, J. (1986). The origin and early diversification of birds. Paleobiology 12: 383-399.
Cracraft, J. (2001) Avian evolution, Gondwana biogeography and the Cretaceous-Tertiary mass extinction event: Proc. R. Soc. London, p. 459-469.
Cracraft, J., and Clarke, J. (2001) The basal clades of modern birds: In: New Perspectives on the origin and early evolution of Birds, Proceedings of the International Symposium in Honor of John H. Ostrom, edited by Gauthier, J., and Gall, L. F., Yale Peabody Museum, p. 143-156.