@article{lees2010theoretical,
  title={Theoretical maximum capacity as benchmark for empty vehicle redistribution in personal rapid transit},
  author={Lees-Miller, John and Hammersley, John and Wilson, R},
  journal={Transportation Research Record: Journal of the Transportation Research Board},
  number={2146},
  pages={76--83},
  year={2010},
  publisher={Transportation Research Board of the National Academies}
}