| Haas, P., 1999. Food and feeding site selection in white rhino at Ithala GR during winter. EEP Research Group Newsletter 6: 23
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| Haas, P., 1998. Die Nahrungsoekologie des Breitmaulnashornes (Ceratotherium simum) im Itala Game Reserve. Erlangen-Nurnberg, Zoologisches Institut der Friedrich-Alexander Universitat, Diplomarbeit, pp. 1-119
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