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| Author | Title | Year | Publication | Serial | Volume | Pages |
|---|---|---|---|---|---|---|
| Bekoff,M; Allen, C; Burghardt, G. M. | The cognitive animal: Empirical and theoretical perspectives on animal cognition | 2003 | Computers and Mathematics with Applications | 3496 | 46 | 508-509 |
| Wasilewski A. | 'Friendship' in ungulates? – Sociopositive relationships between non-related herd members of the same species | 2003 | 824 | |||
| Tiefenbacher, S.; Lee, B.; Meyer, J.S.; Spealman, R.D. | Noninvasive technique for the repeated sampling of salivary free cortisol in awake, unrestrained squirrel monkeys | 2003 | American Journal of Primatology | 5573 | 60 | 69-75 |