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Collard, M. (2004-01-08). Grades and Transitions in Human Evolution. In The Speciation of Modern Homo Sapiens. : British Academy. Retrieved 29 Jul. 2021, from https://britishacademy.universitypressscholarship.com/view/10.5871/bacad/9780197263112.001.0001/upso-9780197263112-chapter-5.