@inproceedings{sun2021tree,
  title={Tree-constrained pointer generator for end-to-end contextual speech recognition},
  author={Sun, Guangzhi and Zhang, Chao and Woodland, Philip C},
  booktitle={2021 IEEE Automatic Speech Recognition and Understanding Workshop (ASRU)},
  pages={780--787},
  year={2021},
  organization={IEEE}
}