@article{zhang2020unsupervised,
  author={Zhang, Yabin and Deng, Bin and Tang, Hui and Zhang, Lei and Jia, Kui},
  journal={IEEE Transactions on Pattern Analysis and Machine Intelligence}, 
  title={Unsupervised Multi-Class Domain Adaptation: Theory, Algorithms, and Practice}, 
  year={2022},
  volume={44},
  number={5},
  pages={2775-2792},
  doi={10.1109/TPAMI.2020.3036956}
}