D.T. Ksepka and J.A. Clarke (2010). Bulletin of the American Museum of Natural History, 337: 1-77.
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/D.T. Ksepka, J.A. Clarke, T. DeVries, and M. Urbina (2008). Journal of Anatomy 213: 131–147.
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/J.A. Clarke, D.T. Ksepka, M. Stucchi, M. Urbina, N. Giannini, S. Bertelli, Y.Narváez, and C. Boyd (2007). Proceedings of the National Academy of Sciences, USA 104:11545-11550.
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