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^Richard J. Butler; Stephen L. Brusatte; Brian B. Andres; Roger B. J. Benson (2012). "How do geological sampling biases affect studies of morphological evolution in deep time? A case study of the Pterosauria (Reptilia: Archosauria)". Evolution. 66 (1): 147–162. doi:10.1111/j.1558-5646.2011.01415.x. PMID22220871.Parameter |s2cid= yang tidak diketahui akan diabaikan (bantuan)