@article{econhot_econhot-cited-7d2fc8c4edab026d,
  title = {Nonparametric Estimation of Average Treatment Effects Under Exogeneity: A Review},
  author = {Guido W. Imbens},
  journal = {The Review of Economics and Statistics},
  year = {2004},
  volume = {86},
  number = {1},
  pages = {4-29},
  doi = {10.1162/003465304323023651},
  url = {https://doi.org/10.1162/003465304323023651}
}