@inproceedings{offpolicyevaluationandlearningfor,
  title = {Off-Policy Evaluation and Learning for External Validity under a Covariate Shift},
  author = {Masahiro Kato and Masatoshi Uehara and Shota Yasui},
  year = {2020},
  booktitle = {NeurIPS 2020 12},
  eprint = {2002.11642},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2002.11642v3},
}