J.A. Clarke, D.T. Ksepka, A. Smith, and M. Norell (2009). Zoological Journal of the Linnean Society 157: 586–611.
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/D.T Ksepka and J.A. Clarke (2009). The Auk 126: 245-259.
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/C.A. Boyd, C. Brown, R. Sheetz, and J.A. Clarke (2009). Journal of Vertebrate Paleontology 29: 758-770.
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