* {{citeCita journalpubblicazione|authorautore=William J. Murphy, Eduardo Eizirik, Mark S. Springer et al.|titletitolo=Resolution of the Early Placental Mammal Radiation Using Bayesian Phylogenetics|journalrivista=Science|volume=294|issuenumero=5550|pagespagine=2348-2351|datedata=14 Decemberdicembre 2001|id={{doi|10.1126/science.1067179}}}}
* {{citeCita journalpubblicazione|authorautore=Kriegs, Jan Ole, Gennady Churakov, Martin Kiefmann, Ursula Jordan, Juergen Brosius, Juergen Schmitz|yearanno=2006|titletitolo=Retroposed Elements as Archives for the Evolutionary History of Placental Mammals|journalrivista=PLoS Biol|volume=4|issuenumero=4|pagespagine=e91|id={{doi|10.1371/journal.pbio.0040091}}}} ([http://biology.plosjournals.org/perlserv/?request=get-pdf&file=10.1371_journal.pbio.0040091-S.pdf pdf version])