@article{inferenceindifferenceindifferenceshow,
  title = {Inference in Difference-in-Differences: How Much Should We Trust in Independent Clusters?},
  author = {Bruno Ferman},
  year = {2019},
  eprint = {1909.01782},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1909.01782v7},
}