@misc{indiciae89ec659e52d1,
  title = {Five rules for the evolution of cooperation.},
  author = {Martin A Nowak},
  year = {2006},
  doi = {10.1126/science.1133755},
  url = {https://pubmed.ncbi.nlm.nih.gov/17158317/},
  note = {Source identifier: 17158317}
}