Bakker, R.T., Sullivan, R.M., Porter, V., Larson, P. & Saulsbury, S.J., 2006. Dracorex hogwartsia, n. gen., n. sp., a Spiked, Flat-Headed Pachycephalosaurid Dinosaur from the Upper Cretaceous Hell Creek Formation of South Dakota. New Mexico Mus. Nat. Hist. Sci. Bull. 35: 331-345. ≡
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