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Carr (2011). „Evidence for high taxonomic and morphologic tyrannosaurid diversity in the Late Cretaceous (Late Campanian) of the American Southwest and a new short-skulled tyrannosaurid from the Kaiparowits formation of Utah”. Naturwissenschaften98 (3), 241–246. o. DOI:10.1007/s00114-011-0762-7. PMID21253683.
