@article{robustcausalinferenceundercovariateshift,
  title = {Assessing External Validity Over Worst-case Subpopulations},
  author = {Sookyo Jeong and Hongseok Namkoong},
  year = {2020},
  eprint = {2007.02411},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2007.02411v3},
}