@article{Johnson12a,
  title = {by Philip Ball},
  author = {Paul E. Johnson},
  year = {2012},
  url = {http://jasss.soc.surrey.ac.uk/15/4/reviews/3.html},
  researchr = {https://researchr.org/publication/Johnson12a},
  cites = {0},
  citedby = {0},
  journal = {J. Artificial Societies and Social Simulation},
  volume = {15},
  number = {4},
}