@inproceedings{wang2014tracking,
  title={Tracking human queues using single-point signal monitoring},
  author={Wang, Yan and Yang, Jie and Chen, Yingying and Liu, Hongbo and Gruteser, Marco and Martin, Richard P},
  booktitle={Proceedings of the 12th annual international conference on Mobile systems, applications, and services},
  pages={42--54},
  year={2014},
  organization={ACM}
}