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Frost SD, Volz EM.Frost SD, et al.Philos Trans R Soc Lond B Biol Sci. 2010 Jun 27;365(1548):1879-90. doi: 10.1098/rstb.2010.0060.Philos Trans R Soc Lond B Biol Sci. 2010.PMID: 20478883Free PMC article.
Frost SD, Volz EM.Frost SD, et al.Philos Trans R Soc Lond B Biol Sci. 2013 Feb 4;368(1614):20120208. doi: 10.1098/rstb.2012.0208. Print 2013 Mar 19.Philos Trans R Soc Lond B Biol Sci. 2013.PMID: 23382430Free PMC article.