@article{szolnoki_perc_2014, 
  title={Evolution of extortion in structured populations}, 
  volume={89}, 
  DOI={10.1103/physreve.89.022804}, 
  publisher={American Physical Society (APS)}, 
  author={Szolnoki and Perc}, 
  year={2014}, 
  month={Feb}
  }