diff --git a/paper.bib b/paper.bib
index 78b0839..c1d2102 100644
--- a/paper.bib
+++ b/paper.bib
@@ -15,7 +15,7 @@ @phdthesis{holke_scalable_2018
   school = {Rheinische Friedrich-Wilhelms-Universität Bonn},
   author = {Holke, Johannes},
   year = {2018},
-  doi = {20.500.11811/7661}
+  url = {https://hdl.handle.net/20.500.11811/7661}
 }
 
 @article{holke_optimized_2021,