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Author | Title | Year | Publication | Serial | Volume | Pages |
---|---|---|---|---|---|---|
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 |
Ward, C.; Smuts, B.B. | Quantity-based judgments in the domestic dog (Canis lupus familiaris) | 2007 | Animal Cognition | 2440 | 10 | 71-80 |