TY  - JOUR
TI  - Difference-in-Differences with multiple time periods
AU  - Brantly Callaway
AU  - Pedro H.C. Sant’Anna
JO  - Journal of Econometrics
PY  - 2021
VL  - 225
IS  - 2
DO  - 10.1016/j.jeconom.2020.12.001
UR  - https://doi.org/10.1016/j.jeconom.2020.12.001
ER  -