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  Author Title Year Publication Serial Volume Pages Links
Boysen, S.T.; Berntson, G.G. Responses to quantity: perceptual versus cognitive mechanisms in chimpanzees (Pan troglodytes) 1995 Journal of Experimental Psychology. Animal Behavior Processes 2783 21 82-86 details   openurl
Zentall, T.R.; Sherburne, L.M. Role of differential sample responding in the differential outcomes effect involving delayed matching by pigeons 1994 Journal of experimental psychology. Animal behavior processes 257 20 390-401 details   openurl
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