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Walker, E. P., & Nowak, R. M. (1999). Walker's Mammals of the World.
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Kolter, L., Schach, C., & Weber, T. (1999). Habitat use of feral and Przewalski's horses. Natur- und Kulturlandschaft, 3(332-342).
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DUNN, L. J. (1999). PRELIMINARY INVESTIGATION OF EQUINE LEARNING AND MEMORY.
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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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Tschudin, A. (1999). Relative Neocortex Size and Its Correlates in Dolphins: Comparisons with Humans and Implications for Mental Evolution. Ph.D. thesis, University of Natal, Pietermaritzburg, South Africa.
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Tomasello, M. (1999). The cultural origins of human cognition. Camebridge,MA.: Harvard University Press.
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Mladenoff, D. J., Sickley, T. A., & Wydeven, A. P. (1999). Predicting gray wolf landscape recolonization: logistic regression models vs. new field data. Ecol Appl, 9.
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Berger, A., Scheibe, K. - M., Eichhorn, K., Scheibe, A., & Streich, J. (1999). Diurnal and ultradian rhythms of behaviour in a mare group of Przewalski horse (Equus ferus przewalskii), measured through one year under semi-reserve conditions. Appl. Anim. Behav. Sci., 64(1), 1–17.
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