См. Felix Oberholzer-Gee, Joel Waldfogel, and Matthew W. White, “Social Learning and Coordination in High-Stakes Games: Evidence from Friend or Foe,” NBER Working Paper No. W9805, June 2003. Available at SSRN: . См. также John A List, “Friend or Foe? A Natural Experiment of the Prisoner’s Dilemma,” Review of Economics and Statistics 88, no. 3 (2006): 463–471.