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Berger J,. (1983). Ecology and catastrophic mortality in wild horses: Implantations for interpreting fossil assemblages. Science 220, , 1403–1404.
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Hildebrand M,. (1965). Symmetrial gaits of horses. Science, 150.
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Lowenstein Jm,. (1985). The cry of the quagga. Counterpoints in Science, , 40–42.
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Gallup GG. (1970). Chimpanzees: self-recognition. Science, 167, 86.
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Clayton NS, & Dickinson A. (2006). Rational rats. Science, 9, 472.
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Hartmann, E., Christensen, J. W., & McGreevy, P. D. Dominance and leadership: Useful concepts in human-horse interactions? Journal of Equine Veterinary Science, .
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A. Wiggins, & K. Crowston. (2011). From Conservation to Crowdsourcing: A Typology of Citizen Science. In 2011 44th Hawaii International Conference on System Sciences (pp. 1–10). 2011 44th Hawaii International Conference on System Sciences.
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