@misc{indiciaed3a41dc018b4,
  title = {Evolution of cooperation without reciprocity.},
  author = {R L Riolo and M D Cohen and R Axelrod},
  year = {2001},
  doi = {10.1038/35106555},
  url = {https://pubmed.ncbi.nlm.nih.gov/11719803/},
  note = {Source identifier: 11719803}
}