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Author Title Year (down) Publication Serial Volume Pages
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
Zentall, T.R.; Hogan, D.E.; Edwards, C.A.; Hearst, E. Oddity learning in the pigeon as a function of the number of incorrect alternatives 1980 Journal of experimental psychology. Animal behavior processes 268 6 278-299