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Hopley, Philip and Marshall, J.D. and Weedon, G.P. and Latham, A.G. and Herries, A.I.R. and Kuykendall, K.L. (2007) Orbital forcing and the spread of C4 grasses in the late Neogene: stable isotope evidence from South African speleothems. Journal of Human Evolution 53 (5), pp. 620-634. ISSN 0047-2484.