@article{derenyi1998realistic,
  title={Realistic models of biological motion},
  author={Der{\'e}nyi, Imre and Vicsek, Tam{\'a}s},
  journal={Physica A: Statistical Mechanics and its Applications},
  volume={249},
  number={1},
  pages={397--406},
  year={1998},
  publisher={North-Holland}
}