 | Ramsay, E.C.; Kasman, L.H.; Lasley, B.L., 1987. Urinary steroid evaluations to monitor ovarian function in exotic ungulates: V. Estrogen and pregnanediol-3-glucuronide excretion in the black rhinoceros (Diceros bicornis). Zoo Biology 6: 275-282, fig. 1, tables 1-2
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 | Kasman, L.H.; Ramsay, E.C.; Lasky, B.L., 1986. Urinary steroid evaluations to monitor ovarian function in exotic ungulates: III. Estrone sulfate and Pregnanediol-3-Glucoronide excretion in the Indian Rhinoceros (Rhinoceros unicornis). Zoo Biology 5: 355-361, figs. 1-3
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