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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
Sole, L.M.; Shettleworth, S.J.; Bennett, P.J. Uncertainty in pigeons 2003 Psychonomic bulletin & review 366 10 738-745 details   openurl
Pollmann, U. [Keeping of horses in circus and show businesses] 2002 DTW. Deutsche Tierarztliche Wochenschrift 1914 109 126-129 details   openurl
Williams, N. Evolutionary psychologists look for roots of cognition 1997 Science (New York, N.Y.) 2845 275 29-30 details   openurl
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