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| Author | Title | Year | Publication | Serial | Volume | Pages  |
|---|---|---|---|---|---|---|
| McGonigle, B. | Can apes learn to count? | 1985 | Nature | 2794 | 315 | 16-17 |
| Whiten, A.; McGrew, W.C. | Is this the first portrayal of tool use by a chimp? | 2001 | Nature | 739 | 409 | 12 |