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Tyler R. Lyson, Gabe S. Bever, Torsten M. Scheyer, Allison Y. Hsiang, Jacques A. Gauthier: Evolutionary Origin of the Turtle Shell. In: Current Biology. Bd. 23, Nr. 12, 2013, ISSN0960-9822, S. 1113–1119, doi:10.1016/j.cub.2013.05.003.