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[3] Wager, S., & Athey, S. (2018). Estimation and inference of heterogeneous treatment effects using random forests. Journal of the American Statistical Association, 113(523), 1228–1242.
[4] Chernozhukov, V., Chetverikov, D., Demirer, M., Duflo, E., Hansen, C., Newey, W., & Robins, J. (2018). Double/debiased machine learning for treatment and structural parameters.
[5] Sant'Anna, P. H., & Zhao, J. (2020). Doubly robust difference-in-differences estimators. Journal of Econometrics, 219(1), 101–122.
[6] R pkg. Doubly Robust Difference-in-Differences
[7] Chang, N. C. (2020). Double/debiased machine learning for difference-in-differences models. The Econometrics Journal, 23(2), 177–191. 23