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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 |