![](http://www.rhinoresourcecenter.com/style_images/1/cat_arrow.gif) | Hindle, J.E.; Moestl, E.; Hodges, J.K., 1992. Measurement of urinary oestrogens and 20a-dihydroprogesterone during ovarian cycles of black (Diceros bicornis) and white (Ceratotherium simum) rhinoceroses. Journal of Reproduction and Fertility 94: 237-249, figs. 1-5, table 1
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