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Bekoff, M., Allen, C., & Burghardt, G. M. (2003). The cognitive animal: Empirical and theoretical perspectives on animal cognition. Computers and Mathematics with Applications, 46, 508–509.
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Wasilewski A. (2003). 'Friendship' in ungulates? – Sociopositive relationships between non-related herd members of the same species. Ph.D. thesis, University of Marburg, Marburg.
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Tiefenbacher, S., Lee, B., Meyer, J. S., & Spealman, R. D. (2003). Noninvasive technique for the repeated sampling of salivary free cortisol in awake, unrestrained squirrel monkeys. Am. J. Primatol., 60(2), 69–75.
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