@article{causalinferenceunderunmeasuredconfoundin,
  title = {Causal Inference Under Unmeasured Confounding With Negative Controls: A Minimax Learning Approach},
  author = {Nathan Kallus and Xiaojie Mao and Masatoshi Uehara},
  year = {2021},
  eprint = {2103.14029},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2103.14029v4},
}