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Hagen, K., & Broom, D. M. (2004). Emotional reactions to learning in cattle. Appl. Anim. Behav. Sci., 85(3), 203–213.
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Williams, J. L., Friend, T. H., Nevill, C. H., & Archer, G. (2004). The efficacy of a secondary reinforcer (clicker) during acquisition and extinction of an operant task in horses. Appl. Anim. Behav. Sci., 88(3-4), 331–341.
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