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| Author | Title | Year | Publication | Serial | Volume | Pages |
|---|---|---|---|---|---|---|
| Klein, E.D.; Bhatt, R.S.; Zentall, T.R. | Contrast and the justification of effort | 2005 | Psychonomic bulletin & review | 223 | 12 | 335-339 |
| Vonk, J. | Gorilla ( Gorilla gorilla gorilla) and orangutan ( Pongo abelii) understanding of first- and second-order relations | 2003 | Animal Cognition | 2578 | 6 | 77-86 |