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Author  |
Title | Year | Publication | Serial | Volume | Pages |
|---|---|---|---|---|---|---|
| Young, R.J. | Environmental Enrichment for Captive Animals | 2003 | Wiley Interdiscip Rev Cogn Sci | 6596 | ||
| Zentall, T.R.; Clement, T.S.; Weaver, J.E. | Symmetry training in pigeons can produce functional equivalences | 2003 | Psychonomic bulletin & review | 235 | 10 | 387-391 |