@article{differenceindifferenceswithtimevarying,
  title = {Difference in Differences with Time-Varying Covariates},
  author = {Carolina Caetano and Brantly Callaway and Stroud Payne and Hugo Sant'Anna Rodrigues},
  year = {2022},
  eprint = {2202.02903},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2202.02903v3},
}