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  Author (up) Title Year Publication Serial Volume Pages Links
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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