@article{auexpressionknowledgeconstrained,
  title = {AU-Expression Knowledge Constrained Representation Learning for Facial Expression Recognition},
  author = {Tao Pu and Tianshui Chen and Yuan Xie and Hefeng Wu and Liang Lin},
  year = {2020},
  eprint = {2012.14587},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2012.14587v2},
}