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  Author (up) Title Year Publication Serial Volume Pages Links
Beran, M.J.; Beran, M.M.; Harris, E.H.; Washburn, D.A. Ordinal judgments and summation of nonvisible sets of food items by two chimpanzees and a rhesus macaque 2005 Journal of Experimental Psychology. Animal Behavior Processes 2766 31 351-362 details   doi
Dougherty, D.M.; Lewis, P. Stimulus generalization, discrimination learning, and peak shift in horses 1991 Journal of the experimental analysis of behavior 1764 56 97-104 details   doi
Henderson, J.; Hurly, T.A.; Healy, S.D. Spatial relational learning in rufous hummingbirds (Selasphorus rufus) 2006 Animal Cognition 2465 9 201-205 details   doi
Ikeda, M.; Patterson, K.; Graham, K.S.; Ralph, M.A.L.; Hodges, J.R. A horse of a different colour: do patients with semantic dementia recognise different versions of the same object as the same? 2006 Neuropsychologia 4059 44 566-575 details   doi
Pepperberg, I.M.; Brezinsky, M.V. Acquisition of a relative class concept by an African gray parrot (Psittacus erithacus): discriminations based on relative size 1991 Journal of Comparative Psychology 3610 105 286-294 details   doi
Ward, C.; Smuts, B.B. Quantity-based judgments in the domestic dog (Canis lupus familiaris) 2007 Animal Cognition 2440 10 71-80 details   doi
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