Universal power law governing pedestrian interactions. Karamouzas, I., Skinner, B., & Guy, S. J Physical Review Letters, 113(23):238701, American Physical Society, Dec, 2014.
doi  bibtex   
@article{karamouzas2014universal,
  title={Universal power law governing pedestrian interactions},
  author={Karamouzas, Ioannis and Skinner, Brian and Guy, Stephen J},
  journal={Physical Review Letters},
  volume={113},
  number={23},
  pages={238701},
  year={2014},
  month = {Dec},
  numpages = {5},
  publisher={American Physical Society},
  doi={10.1103/PhysRevLett.113.238701}
}

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