@article{econhot_econhot-reading-15,
  title = {Difference-in-Differences with multiple time periods},
  author = {Brantly Callaway and Pedro H.C. Sant’Anna},
  journal = {Journal of Econometrics},
  year = {2021},
  volume = {225},
  number = {2},
  pages = {200-230},
  doi = {10.1016/j.jeconom.2020.12.001},
  url = {https://doi.org/10.1016/j.jeconom.2020.12.001}
}