@misc{indiciaed2f181ab75f1,
  title = {Human cooperation: second-order free-riding problem solved?},
  author = {James H Fowler},
  year = {2005},
  doi = {10.1038/nature04201},
  url = {https://pubmed.ncbi.nlm.nih.gov/16177738/},
  note = {Source identifier: 16177738}
}