@article{thesingularangleofnonlinearsystems,
  title = {The Singular Angle of Nonlinear Systems},
  author = {Chao Chen and Wei Chen and Di Zhao and Sei Zhen Khong and Li Qiu},
  year = {2021},
  eprint = {2109.01629},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2109.01629v1},
}