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Dalma et al. 2021. Dalma, S. G.; Lucas, S. G.; Jasinski, S. E.; Lichtig, A. J.; Dodson, P. (2021). "The oldest centrosaurine: a new ceratopsid dinosaur (Dinosauria: Ceratopsidae) from the Allison Member of the Menefee Formation (Upper Cretaceous, early Campanian), northwestern New Mexico, USA". PalZ. 95 (2): 291–335. doi:10.1007/s12542-021-00555-w. S2CID234351502.