@article{measuringpolicepresenceinuscitiesusing,
  title = {Smartphone Data Reveal Neighborhood-Level Racial Disparities in Police Presence},
  author = {M. Keith Chen and Katherine L. Christensen and Elicia John and Emily Owens and Yilin Zhuo},
  year = {2021},
  eprint = {2109.12491},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2109.12491v2},
}