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Cerling TE, Ehleringer JR, Harris JM.Cerling TE, et al.Philos Trans R Soc Lond B Biol Sci. 1998 Jan 29;353(1365):159-70; discussion 170-1. doi: 10.1098/rstb.1998.0198.Philos Trans R Soc Lond B Biol Sci. 1998.PMID: 9507562Free PMC article.Review.
Ward JK, Harris JM, Cerling TE, Wiedenhoeft A, Lott MJ, Dearing MD, Coltrain JB, Ehleringer JR.Ward JK, et al. Among authors: cerling te.Proc Natl Acad Sci U S A. 2005 Jan 18;102(3):690-4. doi: 10.1073/pnas.0408315102. Epub 2005 Jan 10.Proc Natl Acad Sci U S A. 2005.PMID: 15642948Free PMC article.