“Introduction: Social Traps and Simple Games.” The Calculus of Selfishness: by Karl Sigmund, Princeton University Press, PRINCETON; OXFORD, 2010, pp. 1–24, www.jstor.org/stable/j.ctt7sw18.4. Accessed 2 Dec. 2020.
Sigmund, K. (2010). Introduction: Social Traps and Simple Games. In The Calculus of Selfishness: (pp. 1-24). PRINCETON; OXFORD: Princeton University Press. Retrieved December 2, 2020, from http://www.jstor.org/stable/j.ctt7sw18.4
Sigmund, Karl. "Introduction: Social Traps and Simple Games." In The Calculus of Selfishness:, 1-24. PRINCETON; OXFORD: Princeton University Press, 2010. Accessed December 2, 2020. http://www.jstor.org/stable/j.ctt7sw18.4.
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