@article{crossvalidationwhatdoesitestimateand,
  title = {Cross-validation: what does it estimate and how well does it do it?},
  author = {Stephen Bates and Trevor Hastie and Robert Tibshirani},
  year = {2021},
  eprint = {2104.00673},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2104.00673v4},
}