@article{econhot_econhot-cited-45981715b6dbf755,
  title = {Simple formulas for standard errors that cluster by both firm and time},
  author = {Samuel Brodsky Thompson},
  journal = {Journal of Financial Economics},
  year = {2010},
  volume = {99},
  number = {1},
  pages = {1-10},
  doi = {10.1016/j.jfineco.2010.08.016},
  url = {https://doi.org/10.1016/j.jfineco.2010.08.016}
}