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Ginsberg, J. R. (1988). Social organisation and mating strategies of an arid adapted equid: The Grevy`s zebra. Ph.D. thesis, Princeton University, Princeton.
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Boyd, L.,. (1988). The behavior of Przewalski's horses. Ph.D. thesis, , Cornell University.
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KIRKPATRICK JF et al,. (1988). Pregnancy determination in uncaptured feral Horses based on steroid metabolites in urine – soaked snow and free steroids in feces.
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Berger, J.,. (1988). Social systems, resources, and phylogenetic inertia: an experimental test and its limitations. In C. N. Slobochikoff (Ed.), Ecology of Social Behavior (pp. 157–186). San Diego: Academic Press.
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Kozarovitskii, L. B. (1988). [Further comment on the distinction between humans and animals]. Nauchnye Doki Vyss Shkoly Biol Nauki, (3), 42–45.
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Byrne, R., & Whiten, A. (1988). Machiavellian Intelligence. Oxford: Oxford Univ Press.
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Byrne, R., & Whiten, A. (1988). The machiavellian intelligence hypothesis:Editorial. In Machiavellian Intelligence (pp. 1–9). Oxford: Oxford Univ Press.
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Hauser M.D. (1988). Invention and social transmission: new data from wild vervet monkeys. In Machiavellian Intelligence (pp. 327–343). Oxford: Oxford Univ Press.
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Cheney, D. L., & Seyfarth, R. M. (1988). Social and non.social knowledge in vervet monkeys. In Machiavellian Intelligence (pp. 255–270). Oxford: Oxford Univ Press.
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Dasser V. (1988). Mapping social concepts in monkeys. In Machiavellian Intelligence (pp. 85–93). Oxford: Oxford Univ Press.
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