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Author (up) 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