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yxlaoban118 · Jul 20, 2021 · 5a112d7 · 5a112d7
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@@ -103,7 +103,7 @@ Simon Freyaldenhoven, Christian Hansen, Jesse M. Shapiro (2019). [Pre-event Tren
 
 [Andrew Goodman-Bacon](http://goodman-bacon.com/) (2021). [Difference-in-differences with variation in treatment timing](https://www.sciencedirect.com/science/article/abs/pii/S0304407621001445). Journal of Econometrics.
 
-[Jonathan Roth](https://jonathandroth.github.io/) [<img width="12px" src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/twitter.svg" />](https://twitter.com/jondr44), Pedro H.C. Sant'Anna (2021) [Efficient Estimation for Staggered Rollout Designs](https://arxiv.org/pdf/2102.01291.pdf).
+[Jonathan Roth](https://jonathandroth.github.io/) [<img width="12px" src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/twitter.svg" />](https://twitter.com/jondr44), Pedro H.C. Sant'Anna (2021). [Efficient Estimation for Staggered Rollout Designs](https://arxiv.org/pdf/2102.01291.pdf).
 
 Pedro H.C. Sant'Anna, [Jun Zhao](https://www.junbeanzhao.com/) (2020). [Doubly robust difference-in-differences estimators](https://www.sciencedirect.com/science/article/abs/pii/S0304407620301901), Journal of Econometrics.