@inproceedings{sun2019supervised,
  title={Supervised hierarchical cross-modal hashing},
  author={Sun, Changchang and Song, Xuemeng and Feng, Fuli and Zhao, Wayne Xin and Zhang, Hao and Nie, Liqiang},
  booktitle={ACM SIGIR conference on research and development in information retrieval},
  pages={725--734},
  year={2019}
}