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Thackeray, J. F. (1988). Zebras from wonderwerk cave, northern Cape province, South Africa: attempts to distinguish Equus burchelli and E. quagga. Suid- Afrikaanse Tydsskrif vir Wetenskap, 84, 99–101.
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Vrba, E. S. (1985). Environment and evolution: alternative causes of the temporal distribution of evolutionary events. S Afr J Anim Sci, 81, 229–236.
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