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Wilkins, Jayne; Chazan, Michael (2012). Blade production ∼500 thousand years ago at Kathu Pan 1, South Africa: support for a multiple origins hypothesis for early Middle Pleistocene blade technologies. Journal of Archaeological Science. 39 (6): 1883–1900. doi:10.1016/j.jas.2012.01.031. ISSN0305-4403.