@article{wu2016telcovis,
  title={Telcovis: Visual exploration of co-occurrence in urban human mobility based on telco data},
  url={https://ieeexplore.ieee.org/document/7192730},
  DOI={10.1109/TVCG.2015.2467194},
  journal={IEEE Transactions on Visualization and Computer Graphics},
  publisher={IEEE},
  author={Wu, Wenchao and Xu, Jiayi and Zeng, Haipeng and Zheng, Yixian and Qu, Huamin and Ni, Bing and Yuan, Mingxuan and Ni, Lionel M},
  year={2016},
  volume={22},
  number={1},
  pages={935-944}
}