Reference
Elliot Sober and David Sloan Wilson,Unto Others: The Evolution and Psychology of Unselfish Behavior. Cambridge, Mass.: Harvard University Press, 1998. Pp. 416. US$18.95 PB.
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Canfell, K., Spencer, H.G. & Oldroyd, B. Defending the group from the terror within. Metascience 10, 192–202 (2001). https://doi.org/10.1007/BF02914842
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DOI: https://doi.org/10.1007/BF02914842