@article{discoveryofimportantcrossroadsinroad,
  title = {Discovery of Important Crossroads in Road Network using Massive Taxi Trajectories},
  author = {Ming Xu and Jianping Wu and Yiman Du and Haohan Wang and Geqi Qi and Kezhen Hu and Yun-Peng Xiao},
  year = {2014},
  eprint = {1407.2506},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1407.2506v6},
}