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Wingfield, J. C.,, & Ramenofsky, M. (1999). Hormones and the behavioral ecology of stress. In P. H. M. Balm (Ed.), Stress physiology in animals. (pp. 1–51). Sheffield, United Kingdom: Sheffield Academic Press.
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Whitehead, H., & Dufault, S. (1999). Techniques for Analyzing Vertebrate Social Structure Using Identified Individuals: Review and Recommendations. In Charles T. Snowden and Timothy J. Roper J. S. R. Peter J.B. Slater (Ed.), (Vol. Volume 28, pp. 33–74). Academic Press.
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Walker, E. P., & Nowak, R. M. (1999). Walker's Mammals of the World.
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Lamarck, J. - B. (1999). Philosophie zoologique.
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Heipertz- Hengst, C. (1999). Pferde richtig trainieren. Lüneburg: Cadmos.
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Mills, D. S., & Nankervis, K. J. (1999).
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Tomasello, M. (1999). The cultural origins of human cognition. Camebridge,MA.: Harvard University Press.
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McDonnell, S. (1999). Understanding horse behavior. Your guide to horse health care and management. Lexington, KY 40544-4038: Blood-Horse Inc.
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Ruggieri, V. (1999). The running horse stops: the hypothetical role of the eyes in imagery of movement. Percept Mot Skills, 89(3 Pt 2), 1088–1092.
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de Waal, F. B. (1999). The end of nature versus nurture. Sci Am, 281(6), 94–99.
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