@article{amultiscaleoptimizationlearningframework,
  title = {Learning Deformable Image Registration from Optimization: Perspective, Modules, Bilevel Training and Beyond},
  author = {Risheng Liu and Zi Li and Xin Fan and Chenying Zhao and Hao Huang and Zhongxuan Luo},
  year = {2020},
  eprint = {2004.14557},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2004.14557v4},
}