@article{validcausalinferencewithsomeinvalid,
  title = {Valid Causal Inference with (Some) Invalid Instruments},
  author = {Jason Hartford and Victor Veitch and Dhanya Sridhar and Kevin Leyton-Brown},
  year = {2020},
  eprint = {2006.11386},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2006.11386v1},
}