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Mcelreath, R., & Boyd, R.(2007-03-15). Reciprocity. In Mathematical Models of Social Evolution: A Guide for the Perplexed. : University of Chicago Press. Retrieved 26 Apr. 2018, from http://chicago.universitypressscholarship.com/view/10.7208/chicago/9780226558288.001.0001/upso-9780226558264-chapter-4.