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| Author | Title | Year  |
Publication | Serial | Volume | Pages |
|---|---|---|---|---|---|---|
| Suda, C.; Call, J. | Piagetian conservation of discrete quantities in bonobos (Pan paniscus), chimpanzees (Pan troglodytes), and orangutans (Pongo pygmaeus) | 2005 | Animal Cognition | 2494 | 8 | 220-235 |