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Galdikas BMF. (1988). Orangutan diet, range, and activity at Tanjung Puting, Central Borneo. Int. J. Primatol., 9, 1.
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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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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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Byrne, R., & Whiten, A. (1988). Machiavellian Intelligence. Oxford: Oxford Univ Press.
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Jenks, S. M. (1988). Behavioral regulation of social organization and mating in a captive wolf pack. Ph.D. thesis, Univ. Conn. Dept. Biobehavioral Sci, .
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Boyd L. (1988). The behaviour of Przewalski’s horses. Ph.D. thesis, Cornell University, Ithaca, NY.
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Seyfarth, R. M., & Cheney, D. L. (1988). Do monkeys understand their realtions? In R. Byrne, & A. Whiten (Eds.), Machiavellian Intelligence. Oxford: Oxford University Press.
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Dukas, R. (Ed.). (1988). Cognitive Ecology. Chicago: University of Chicago Press.
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Kruska, D. (1988). Mammalian domestication and its effect on brain structure and behavior. In H. J. Jerison, & I. Jerison (Eds.), Intelligence and Evolutionary Biology. New York: Springer-Verlag.
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