@misc{indiciae9bba1edf2e37,
  title = {Variability in group size and the evolution of collective action},
  author = {Jorge Peña and Georg Nöldeke},
  year = {2015},
  doi = {10.1101/021485},
  url = {https://www.biorxiv.org/content/10.1101/021485v1},
  note = {Source identifier: 10.1101/021485}
}