@article{crossvalidationfailuresmallsamplesizes,
  title = {Cross-validation failure: small sample sizes lead to large error bars},
  author = {Gaël Varoquaux},
  year = {2017},
  eprint = {1706.07581},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1706.07581v1},
}