@article{difficultyawareimagesuperresolutionvia,
  title = {Difficulty-aware Image Super Resolution via Deep Adaptive Dual-Network},
  author = {Jinghui Qin and Ziwei Xie and Yukai Shi and Wushao Wen},
  year = {2019},
  eprint = {1904.05802},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1904.05802v2},
}