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| Author | Title | Year | Publication | Serial | Volume | Pages |
|---|---|---|---|---|---|---|
| Kaminski, J.; Call, J.; Tomasello, M. | Body orientation and face orientation: two factors controlling apes' behavior from humans | 2004 | Animal Cognition | 2538 | 7 | 216-223 |
| Vonk, J. | Gorilla ( Gorilla gorilla gorilla) and orangutan ( Pongo abelii) understanding of first- and second-order relations | 2003 | Animal Cognition | 2578 | 6 | 77-86 |
| Van Schaik, C. | Why are some animals so smart? | 2006 | Scientific American | 2830 | 294 | 64-71 |
| Galdikas, B.M. | Orangutan tool use | 1989 | Science (New York, N.Y.) | 2847 | 243 | 152 |