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Author  |
Title | Year | Publication | Serial | Volume | Pages |
|---|---|---|---|---|---|---|
| Boysen, S.T.; Berntson, G.G. | Responses to quantity: perceptual versus cognitive mechanisms in chimpanzees (Pan troglodytes) | 1995 | Journal of Experimental Psychology. Animal Behavior Processes | 2783 | 21 | 82-86 |