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Guth S., & Guth W. (2000). Morality based on cognition in primates. Journal of Consciousness Studies, 7, 43–46.
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Bates, L. A., Lee, P. C., Njiraini, N., Poole, J. H., Sayialel, K., Sayialel, S., et al. (2008). Do Elephants Show Empathy? J Conscious Stud, 15(10-11), 204–225.
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