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Author  |
Title | Year | Publication | Serial | Volume | Pages |
|---|---|---|---|---|---|---|
| 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 |
| 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 |
| 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 |