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  Author Title Year Publication Serial Volume Pages Links
DiGian, K.A.; Friedrich, A.M.; Zentall, T.R. Discriminative stimuli that follow a delay have added value for pigeons 2004 Psychonomic bulletin & review 226 11 889-895 details   openurl
Gibson, B.M.; Shettleworth, S.J. Competition among spatial cues in a naturalistic food-carrying task 2003 Learning & behavior : a Psychonomic Society publication 368 31 143-159 details   openurl
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