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2. Beden, M., 1979. Les élephants (loxodonta et elephas) d’Afrique Orientale: systématique, phylogénie, intérêt biochronologique, vol. I & II. Ph.D. Thesis, University of Poitiers, 567pp.
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4. The proboscideans of the South-East Asian islands;van den Bergh,1996
5. The late Quaternary palaeogeography of mammal evolution in the Indonesian Archipelago;van den Bergh;Palaeogeography, Palaeoclimatology, Palaeoecology,2001