@article{perpetualcallableamericanvolatility,
  title = {Perpetual callable American volatility options in a mean-reverting volatility model},
  author = {Hsuan-Ku Liu},
  year = {2021},
  eprint = {2104.01127},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2104.01127v1},
}