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  Author Title Year Publication Serial Volume Pages Links (down)
Clement, T.S.; Feltus, J.R.; Kaiser, D.H.; Zentall, T.R. “Work ethic” in pigeons: reward value is directly related to the effort or time required to obtain the reward 2000 Psychonomic bulletin & review 248 7 100-106 details   openurl
Clement, T.S.; Weaver, J.E.; Sherburne, L.M.; Zentall, T.R. Simultaneous discrimination learning in pigeons: value of S- affects the relative value of its associated S+ 1998 The Quarterly journal of experimental psychology. B, Comparative and physiological psychology 252 51 363-378 details   openurl
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