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Macfadden, B. J. (1994). Fossil horses Cambridge Univ Press. Cambridge: Cambridge University Press.
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Kuckelkorn, B. (1994). Assessment of pregnancy in Kiang mares (Equus hemionus holdereri ) using estrogen determination in feces. Theriogenology, 42(1), 37–42.
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Judge, P. G., de Waal, F. B., Paul, K. S., & Gordon, T. P. (1994). Removal of a trauma-inflicting alpha matriline from a group of rhesus macaques to control severe wounding. Lab Anim Sci, 44(4), 344–350.
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Judge, P. G., & de Waal, F. B. (1994). Intergroup grooming relations between alpha females in a population of free-ranging rhesus macaques. Folia Primatol (Basel), 63(2), 63–70.
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Ishida, N., Hirano, T., & Mukoyama, H. (1994). Detection of aberrant alleles in the D-loop region of equine mitochondrial DNA by single-strand conformation polymorphism (SSCP) analysis. Anim Genet, 25(4), 287.
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Irvine, C. H. G., & Alexander, S. L. (1994). Factors affecting the circadian rhythm in plasma cortisol concentrations in the horse. Domest. Anim. Endocrinol., 11(2), 227–238.
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Huber W,. (1994). Dokumentation der fünf bekannten Lebendaufnahmen vom Quagga,Equus quagga quagga Gmelin, 1788 (Mammalia, Perissodactyla, Equidae). Spixiana 17, , 193–199.
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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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Heyes, C. M. (1994). Social learning in animals: categories and mechanisms. Biol. Rev., 69(2), 207–231.
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Heyes CM. (1994). Reflections on self-recognition in primates. Anim. Behav., 47, 909.
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