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Clauss, M.; Polster, C.; Kienzle, E.; Wiesner, H.; Baumgartner, K.; Houwald, F.von; Ortmann, S.; Streich, W.J.; Dierenfeld, E.S. 2005. Studies on digestive physiology and feed digestibilities in captive Indian rhinoceros (Rhinoceros unicornis). Journal of Animal Physiology and Animal Nutrition 89: 229-237, figs. 1-3.

Polster, C. 2004. Untersuchungen zur Futterung und Verdauungsphysiologie am indischen Panzernashorn (Rhinoceros unicornis). Aachen, Shaker Verlag. pp. i, 1-182.

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Clauss, M.; Frey, R.; Kiefer, B.; Lechner-Doll, M.; Loehlein, W.; Polster, C.; Roessner, G.E.; Streich, W.J. 2003. The maximum attainable body size of herbivorous mammals: morphophysiological constraints on foregut, and adaptations of hind gut fermenters. Oecologia 136: 14-27.