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