diff --git a/resources/index.md b/resources/index.md
index 16b49d43b885cf04de52bd8e8796417e5d1280a9..598e269cc8da40e288322e3fe5bdb3544d5543c1 100644
--- a/resources/index.md
+++ b/resources/index.md
@@ -88,13 +88,13 @@ by Houtan Bastani
 <p class="indent" markdown="1">
 <i class="fas fa-file-pdf"></i> [Guide to Specifying
 Observation Equations for the Estimation of DSGE
-Models](https://sites.google.com/site/pfeiferecon/Pfeifer_2013_Observation_Equations.pdf?attredirects=0),
+Models](https://drive.google.com/file/d/1r89OU5OE3CBa6tOlj6l3hNVWEaRH5Anv/view?usp=sharing),
 by Johannes Pfeifer
 </p>
 
 <p class="indent" markdown="1">
 <i class="fas fa-file-pdf"></i> [Introduction to Graphs in
-Dynare](https://sites.google.com/site/pfeiferecon/Pfeifer_2014_Dynare_graphs.pdf?attredirects=0),
+Dynare](https://drive.google.com/file/d/1DO1OK5AKLWfcJX49ZPCGo58Ni2LdERw4/view?usp=sharing),
 by Johannes Pfeifer
 </p>