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Pickering, R.; Kramers, J.; Partridge, T.; Kodolanyi, J.; Pettke, Thomas (2010). U-Pb dating of calcite-aragonite layers in speleotherms from hominin sites in South Africa by MC-ICP-MS. Quaternary geochronology, 5(5), pp. 544-558. Amsterdam: Elsevier 10.1016/j.quageo.2009.12.004