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| Author | Title | Year | Publication | Serial | Volume  |
Pages |
|---|---|---|---|---|---|---|
| Stoinski, T.S.; Whiten, A. | Social learning by orangutans (Pongo abelii and Pongo pygmaeus) in a simulated food-processing task | 2003 | Journal of comparative psychology (Washington, D.C. : 1983) | 737 | 117 | 272-282 |
| Galdikas, B.M. | Orangutan tool use | 1989 | Science (New York, N.Y.) | 2847 | 243 | 152 |
| Van Schaik, C. | Why are some animals so smart? | 2006 | Scientific American | 2830 | 294 | 64-71 |
| Mulcahy, N.J.; Call, J. | Apes save tools for future use | 2006 | Science (New York, N.Y.) | 466 | 312 | 1038-1040 |