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  Author Title Year Publication Serial Volume Pages Links
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 details   doi
Rumbaugh, D.M.; Savage-Rumbaugh, S.; Hegel, M.T. Summation in the chimpanzee (Pan troglodytes) 1987 Journal of Experimental Psychology. Animal Behavior Processes 2785 13 107-115 details   openurl
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