Ursing, B. M.; Slack, K. E.; Arnason, U. (April 2000). "Subordinal artiodactyl relationships in the light of phylogenetic analysis of 12 mitochondrial protein-coding genes". Zoologica Scripta. 29 (2): 83–88. doi:10.1046/j.1463-6409.2000.00037.x. S2CID84619585.
Spaulding, M., O'Leary, M.A. & Gatesy, J. (2009): Relationships of Cetacea (Artiodactyla) Among Mammals: Increased Taxon Sampling Alters Interpretations of Key Fossils and Character Evolution. PLoS ONE no 4(9): e7062. doi:10.1371/journal.pone.0007062article
Spaulding, M., O'Leary, M.A. & Gatesy, J. (2009): Relationships of Cetacea (Artiodactyla) Among Mammals: Increased Taxon Sampling Alters Interpretations of Key Fossils and Character Evolution. PLoS ONE no 4(9): e7062. doi:10.1371/journal.pone.0007062article
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Ursing, B. M.; Slack, K. E.; Arnason, U. (April 2000). "Subordinal artiodactyl relationships in the light of phylogenetic analysis of 12 mitochondrial protein-coding genes". Zoologica Scripta. 29 (2): 83–88. doi:10.1046/j.1463-6409.2000.00037.x. S2CID84619585.