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Sansom, R. S.; Randle, E.; Donoghue, P. C. J. (2014). „Discriminating signal from noise in the fossil record of early vertebrates reveals cryptic evolutionary history”. Proceedings of the Royal Society B: Biological Sciences. 282 (1800): 20142245—20142245. ISSN0962-8452. doi:10.1098/rspb.2014.2245.