| Budde, C.; Klump, G., 2003. Vocal repertoire of the black rhino Diceros bicornis ssp. And possibilities of individual identification. Mammalian Biology 68 (1): 42-47, figs. 1-2, tables 1-3
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| Budde, C.; Klump, G., 2002. Vocal communication in the black rhino (Diceros bicornis ssp.) and possibilities of individual communication: pp. 306-309, figs. 1-2, table 1
| In: Schwammer, H.M. et al. A research update on elephants and rhinos: proceedings of the International Elephant and Rhino Research Symposium, Vienna, June 7-11, 2001. Muenster, Schuling: pp. 1-352 |
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| Budde, C.; Klump, G., 2001. Vocal communication of the black rhino (Diceros bicornis ssp.): pp. 71-72
| In: Schwammer, H.M. et al. Recent research on elephants and rhinos: Abstracts of the International Elephant and Rhino Research Symposium, June 7-11, 2001. Vienna, Zoologischer Garten: pp. 1-80 |
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