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Kirkwood, J.K.; Markham, J.; Hawkey, C.M.; Jackson, S.I. 1991. Plasma vitamin E response in two black rhinoceroses following dietary supplementation. Veterinary Record 128 (8): 185-186, fig. 1.

Kirkwood, J.K.; Eva, J.; Jackson, S.I.; Kichenside, T.; Harman, B.; Crawford, M.A. 1989. Nutrition and growth of hand-reared, low birthweight black rhinoceros (Diceros bicornis) during her first six months. Proceedings of the American Association of Zoo Veterinarians 1989: 32-41, figs. 1-5, tables 1-2.