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Houpt, K. A., & Boyd L. (1994). Social Behaviour. In Boyd L., & K. A. Houpt (Eds.), Przewalski's horse. Albany: State university of New York Press.
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Houpt, K. A., & Kusonose, R. (2000). Genetic of behaviour. In A. T. Bowling, & A. Ruvinsky (Eds.), Genetics of the Horse (pp. 281–306). Wallingford Oxfordshire: Cab Intl.
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