@article{NowakSigmund1993,
  title = {A strategy of win-stay, lose-shift that outperforms tit-for-tat in the Prisoner’s Dilemma game},
  author = {Martin Nowak and Karl Sigmund},
  year = {1993},
  month = {July},
  researchr = {http://researchr.org/publication/NowakSigmund1993},
  cites = {0},
  citedby = {0},
  journal = {Nature},
  volume = {364},
}