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Chaudhuri, M., & Ginsberg, J. R. (1990). Urinary androgen concentrations and social status in two species of free ranging zebra (Equus burchelli and E. grevyi). J Reprod Fert, 88, 127–133.
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Baum, M. J. (2006). Mammalian animal models of psychosexual differentiation: when is 'translation' to the human situation possible? Horm Behav, 50(4), 579–588.
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Andrew, R. J. (1974). Changes in visual responsiveness following intercollicular lesions and their effects on avoidance and attack. Brain Behav Evol, 10(4-5), 400–424.
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