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Anthony R. Fiorillo, Ronald S. Tykoski: A new species of the centrosaurine ceratopsid Pachyrhinosaurus from the North Slope (Prince Creek Formation: Maastrichtian) of Alaska. In: Acta Palaeontologica Polonica. Bd. 57, Nr. 3, 2012, ISSN0567-7920, S. 561–573, doi:10.4202/app.2011.0033.
Michael J. Ryan, David C. Evans, Kieran M. Shepherd: A New Ceratopsid from the Foremost Formation (Middle Campanian) of Alberta. In: Canadian Journal of Earth Sciences, Bd. 49, Nr. 11, 2012, ISSN0008-4077, S. 1251–1262, doi:10.1139/e2012-056.