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Henderson DA, Klepac P.Henderson DA, et al.Philos Trans R Soc Lond B Biol Sci. 2013 Jun 24;368(1623):20130113. doi: 10.1098/rstb.2013.0113. Print 2013 Aug 5.Philos Trans R Soc Lond B Biol Sci. 2013.PMID: 23798700Free PMC article.
Henderson DA.Henderson DA.Proc R Soc Lond B Biol Sci. 1977 Oct 19;199(1134):83-97. doi: 10.1098/rspb.1977.0122.Proc R Soc Lond B Biol Sci. 1977.PMID: 21417No abstract available.