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Sutton J.E., & Roberts W.A. (1998). Do pigeons show incidental timing? Some experiments and a suggested hierarchical framework for the study of attention in animal cognition. Behav. Process., 44, 263–275.
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Mercado E., Killebrew D.A., Pack A.A., Macha I.V.B., & Herman L.M. (2000). Generalization of 'same-different' classification abilities in bottlenosed dolphins. Behav. Process., 50, 79–94.
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Desire L., Boissy A., & Veissier I. (2002). Emotions in farm animals: – a new approach to animal welfare in applied ethology. Behav. Process., 60, 165–180.
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