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| Author | Title | Year | Publication  |
Serial | Volume | Pages |
|---|---|---|---|---|---|---|
| Vlamings, P.H.J.M.; Uher, J.; Call, J. | How the great apes (Pan troglodytes, Pongo pygmaeus, Pan paniscus, and Gorilla gorilla) perform on the reversed contingency task: the effects of food quantity and food visibility | 2006 | Journal of Experimental Psychology. Animal Behavior Processes | 2765 | 32 | 60-70 |
| Mulcahy, N.J.; Call, J. | Apes save tools for future use | 2006 | Science (New York, N.Y.) | 466 | 312 | 1038-1040 |
| 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 |