@article{theevolutionaryoriginsofhierarchy,
  title = {The evolutionary origins of hierarchy},
  author = {Henok Mengistu and Joost Huizinga and Jean-Baptiste Mouret and Jeff Clune},
  year = {2015},
  eprint = {1505.06353},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1505.06353v1},
}