@misc{indiciae2489e20ec673,
  title = {How altruism evolves: assortment and synergy.},
  author = {J A Fletcher and M Doebeli},
  year = {2006},
  doi = {10.1111/j.1420-9101.2006.01146.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/16910963/},
  note = {Source identifier: 16910963}
}