@article{generalizedcontrolfunctionsviavariationa,
  title = {General Control Functions for Causal Effect Estimation from Instrumental Variables},
  author = {Aahlad Manas Puli and Rajesh Ranganath},
  year = {2019},
  eprint = {1907.03451},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1907.03451v2},
}