@misc{chen2021attention,
  title={Attention in Attention Network for Image Super-Resolution},
  author={Haoyu Chen and Jinjin Gu and Zhi Zhang},
  year={2021},
  eprint={2104.09497},
  archivePrefix={arXiv},
  primaryClass={cs.CV},
  url={https://arxiv.org/abs/2104.09497}
}