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| Author | Title | Year | Publication | Serial  |
Volume | Pages |
|---|---|---|---|---|---|---|
| Kirkpatrick, J.F.; Wiesner, L.; Kenney, R.M.; Ganjam, V.K.; Turner, J.W. | Seasonal variation in plasma androgens and testosterone in the North American wild horse | 1977 | The Journal of endocrinology | 148 | 72 | 237-238 |
| Chaudhuri, M.; Ginsberg, J.R. | Urinary androgen concentrations and social status in two species of free ranging zebra (Equus burchelli and E. grevyi). | 1990 | Journal of Reproduction and Fertility | 987 | 88 | 127-133 |