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Ryan, M. J.; Evans, D. C.; Currie, P. J.; Loewen, M. A. (2014). «A new chasmosaurine from northern Laramidia expands frill disparity in ceratopsid dinosaurs». Naturwissenschaften. 101 (6): 505–512. Bibcode:2014NW....101..505R. PMID24859020. doi:10.1007/s00114-014-1183-1
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