| Roth, T.L.; O'Brien, J.K.; MacRae, M.A.; Bellem, A.C.; Romo, S.J.; Kroll, J.L.; Brown, J.L., 2001. Ultrasound and endocrine evaluation of the ovarian cycle and early pregnancy in the Sumatran rhinoceros, Dicerorhinus sumatrensis. Reproduction 121: 139-149, figs. 1-5, table 1
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| O'Brien, J.K.; Roth, T.L., 2000. Post-coital sperm recovery and cryopreservation in the Sumatran rhinoceros (Dicerorhinus sumatrensis) and application to gamete rescue in the African black rhinoceros (Diceros bicornis). Journal of Reproduction and Fertility 118 (2): 263-271, figs. 1-2, tables 1-3
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| Roth, T.L.; O'Brien, J.K., 2000. Ultrasonographic characterization of unique follicular dynamics and associated estrogen production in an Indian rhinoceros (Rhinoceros unicornis). Biology of Reproduction 62 (Suppl. 1): 290
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