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| Author | Title | Year | Publication | Serial | Volume | Pages |
|---|---|---|---|---|---|---|
| Chappell, J.; Kacelnik, A. | Tool selectivity in a non-primate, the New Caledonian crow (Corvus moneduloides) | 2002 | Animal Cognition | 2606 | 5 | 71-78 |
| Klein, E.D.; Bhatt, R.S.; Zentall, T.R. | Contrast and the justification of effort | 2005 | Psychonomic bulletin & review | 223 | 12 | 335-339 |