@article{zhao2010differential,
  title={Differential Earth Mover's Distance with its applications to visual tracking},
  author={Zhao, Qi and Yang, Zhi and Tao, Hai},
  journal={Pattern Analysis and Machine Intelligence, IEEE Transactions on},
  volume={32},
  number={2},
  pages={274--287},
  year={2010},
  publisher={IEEE}
}