@article{clusteringandexternalvalidityin,
  title = {Clustering and External Validity in Randomized Controlled Trials},
  author = {Antoine Deeb and Clément de Chaisemartin},
  year = {2019},
  eprint = {1912.01052},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1912.01052v7},
}