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| Author | Title | Year  |
Publication | Serial | Volume | Pages |
|---|---|---|---|---|---|---|
| Spinozzi, G.; Natale, F.; Langer, J.; Brakke, K.E. | Spontaneous class grouping behavior by bonobos (Pan paniscus) and common chimpanzees (P. troglodytes) | 1999 | Animal Cognition | 3356 | 2 | 157-170 |