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Sileshi Semaw et al.: 2.6-Million-year-old stone tools and associated bones from OGS-6 and OGS-7, Gona, Afar, Ethiopia. In: Journal of Human Evolution. Band 45, Nr. 2, 2003, S. 169–177, doi:10.1016/S0047-2484(03)00093-9, Volltext.
Sileshi Semaw: The World’s Oldest Stone Artefacts from Gona, Ethiopia: Their Implications for Understanding Stone Technology and Patterns of Human Evolution Between 2·6–1·5 Million Years Ago. In: Journal of Archaeological Science. Band 27, Nr. 12, 2000, S. 1197–1214, doi:10.1006/jasc.1999.0592, Volltext (PDF; 1,0 MB). (Memento vom 14. Juni 2006 im Internet Archive)