@article{vicsek2000transitions,
  title={Transitions and optimal self-organization in the collective motion in driven systems},
  author={Vicsek, Tam{\'a}s and Helbing, Dirk and Czir{\'o}k, Andr{\'a}s},
  journal={AIP Conference Proceedings},
  volume={501},
  pages={273},
  year={2000}
}