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F.L. Williams; R. R. A.; S.R. Leigh (2006). "Inferring Plio-Pleistocene southern African biochronology from facial affinities in Parapapio and other fossil papionins". American Journal of Physical Anthropology. 132 (2): 163–174. doi:10.1002/ajpa.20504. PMID 17078038. /wiki/Doi_(identifier)