@article{closedformgeodesicsandtrustregionmethod,
  title = {Closed-form geodesics and trust-region method to calculate Riemannian logarithms on Stiefel and its quotient manifolds},
  author = {Du Nguyen},
  year = {2021},
  eprint = {2103.13327},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2103.13327v1},
}