@article{ausersguidetoapproximaterandomization,
  title = {On the implementation of Approximate Randomization Tests in Linear Models with a Small Number of Clusters},
  author = {Yong Cai and Ivan A. Canay and Deborah Kim and Azeem M. Shaikh},
  year = {2021},
  eprint = {2102.09058},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2102.09058v4},
}