@misc{clark2019what,
  title={What Does BERT Look At? An Analysis of BERT's Attention},
  author={Kevin Clark and Urvashi Khandelwal and Omer Levy and Christopher D. Manning},
  year={2019},
  eprint={1906.04341},
  archivePrefix={arXiv},
  primaryClass={cs.CL},
  url={https://arxiv.org/abs/1906.04341}
}