@article{safevaluefunctions,
  title = {Safe Value Functions},
  author = {Pierre-François Massiani and Steve Heim and Friedrich Solowjow and Sebastian Trimpe},
  year = {2021},
  eprint = {2105.12204},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2105.12204v4},
}