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| Author | Title | Year | Publication  |
Serial | Volume | Pages |
|---|---|---|---|---|---|---|
| Rumbaugh, D.M.; Savage-Rumbaugh, S.; Hegel, M.T. | Summation in the chimpanzee (Pan troglodytes) | 1987 | Journal of Experimental Psychology. Animal Behavior Processes | 2785 | 13 | 107-115 |