| Spala, P.; Hradecky, P., 1993. Preliminary determination of nutritional requirements of the pregnant black rhinoceros (Diceros bicornis): pp. 277-281, tables 1-3
| In: Ryder, O.A. Rhinoceros biology and conservation: Proceedings of an international conference, San Diego, U.S.A. San Diego, Zoological Society: pp. i-v, 1-368 |
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| Svitalsky, M.; Vahala, J.; Spala, P., 1993. Breeding experience with northern white rhinoceros (Ceratotherium simum cottoni) at Zoo Dvur Kralove: pp. 282-286, table 1
| In: Ryder, O.A. Rhinoceros biology and conservation: Proceedings of an international conference, San Diego, U.S.A. San Diego, Zoological Society: pp. i-v, 1-368 |
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