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Delsuc, F.; Brinkmann, H.; Chourrout, D.; Philippe, H. Tunicates and not cephalochordates are the closest living relatives of vertebrates. Nature. 2006, 439 (7079): 965–968. PMID 16495997. doi:10.1038/nature04336.
Delsuc, F.; Tsagkogeorga, G.; Lartillot, N.; Philippe, H. Additional molecular support for the new chordate phylogeny. Genesis. 2008, 46 (11): 592–604. PMID 19003928. doi:10.1002/dvg.20450.