@article{friendshipandmobilityusermovementin,
  title = {Friendship and Mobility: User Movement In Location-Based Social Networks},
  author = {E. Cho and S.A. Myers and J. Leskovec},
  year = {2011},
  url = {https://dl.acm.org/doi/abs/10.1145/2020408.2020579},
}