@article{proximalgradientmethodformanifold,
  title = {Proximal Gradient Method for Nonsmooth Optimization over the Stiefel Manifold},
  author = {Shixiang Chen and Shiqian Ma and Anthony Man-Cho So and Tong Zhang},
  year = {2018},
  eprint = {1811.00980},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1811.00980v2},
}