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Author  |
Title | Year | Publication | Serial | Volume | Pages |
|---|---|---|---|---|---|---|
| Potì, P.; Langer, J.; Savage-Rumbaugh, S.; Brakke, K.E. | Spontaneous logicomathematical constructions by chimpanzees (Pan troglodytes, P. paniscus) | 1999 | Animal Cognition | 3125 | 2 | 147-156 |
| 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 |