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Cheney D.L., & Seyfarth, R. M. (1990). How monkeys see the world: Inside the mind of another species. Chicago: University of Chicago Press.
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Rau R.E.,. (1990). Bring back the quagga.
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Schilder, M. B. H. (1990). Social behaviour and social arganization of a herd of plains zebra in a safari park. Ph.D. thesis, , University of Utrecht.
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Würbel, H. (1990). The relationship between social structure and mating system in donkeys & Mating strategies of male donkeys in a promiscuous mating system"l structure and mating system in donkeys &. Diploma thesis, , Faculty of Natural Sciences, University of Berne, Switzerland.
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McGhee, J. R., & Mestecky, J. (1990). In defence of mucosal surfaces. Development of novel vaccines for IgA responses protective at the portals of entry of microbial pathogens. Infect. Dis. Clin. North Am., 4(2), 315–341.
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Cheney, D. L., & Seyfarth, R. M. (1990). How Monkeys See the World.
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Cords, M. (1990). 13th Cong. Int. Primat Soc.
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