@inproceedings{liu2016track,
  title={Track Your Foot Step: Anchor-free Indoor Localization based on Sensing Users' Foot Steps},
  author={Chang Liu and Lei Xie and Chuyu Wang and Jie Wu and Sanglu Lu},
  booktitle={Proceedings of IEEE International Conference on Mobile Ad-hoc and Sensor Systems},
  year={2016},
  publisher={IEEE}
}