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  Author (up) 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
Friedrich, A.M.; Clement, T.S.; Zentall, T.R. Functional equivalence in pigeons involving a four-member class 2004 Behavioural processes 228 67 395-403 details   doi
Friedrich, A.M.; Zentall, T.R. Pigeons shift their preference toward locations of food that take more effort to obtain 2004 Behavioural processes 227 67 405-415 details   doi
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