Scale-free networks provide a unifying framework for the emergence of cooperation.

By Francisco C. Santos, Jorge M. Pacheco. Physical Review Letters, 2005

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Human strategy updating in evolutionary games (2010, background): “Many challenges lie ahead: Theoretical models describe not only interactions on regular lattices, but also heterogeneous networks [42], dynamical networks [43] or set structured populations [44].”
Evolution of Cooperation in Multiplex Networks (2012, background): “[32] Santos, F.”
Evolutionary dynamics of group interactions on structured populations: a review (2013, background): “Social heterogeneity Owing to the overwhelming evidence indicating that social heterogeneity promotes the evolution of cooperation in pairwise social dilemma games [85–89], it is natural to ask what is its impact on games governed by group interactions.”
Evolutionary dynamics on any population structure (2016, methodology): “In the present paper we study games on graphs [28, 5, 6, 7, 8, 9, 10, 11, 12, 37].”