Kock, M.D., 1992. Use of hyaluronidase and increased etorphine (M99) doses to improve induction times and reduce capture-related stress in the chemical immobilkization of the free-ranging black rhinoceros (Diceros bicornis) in Zimbabwe. Journal of Zoo and Wildlife Medicine 23 (2): 181-188, figs. 1-5, tables 1-2
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