@article{derenyi1998collective,
  title={Collective transport in locally asymmetric periodic structures},
  author={Der{\'e}nyi, I and Tegzes, P and Vicsek, T},
  journal={Chaos: An Interdisciplinary Journal of Nonlinear Science},
  volume={8},
  number={3},
  pages={657--664},
  year={1998},
  publisher={American Institute of Physics}
}