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2. The Thinking Ape: Evolutionary Origins of Intelligence;Byrne,1995
3. Complex leaf-gathering skills of mountain gorillas (Gorilla g. beringei): variability and standardization;Byrne;Am. J. Primatol.,1993
4. The comparative and developmental study of self-recognition and imitation: the importance of social factors;Custance,1994
5. Imitation in animals: history, definition and interpretation of data from psychological laboratory;Galef,1988