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BILLET, Guillaume. Phylogeny of the Notoungulata (Mammalia) based on cranial and dental characters. Journal of Systematic Palaeontology. 2011-12-01, roč. 9, čís. 4, s. 481–497. Dostupné online [cit. 2016-11-24]. ISSN1477-2019. DOI10.1080/14772019.2010.528456.