diff --git a/paper/paper.bib b/paper/paper.bib
index 209b213fc..fddf9bdaf 100644
--- a/paper/paper.bib
+++ b/paper/paper.bib
@@ -5,7 +5,7 @@ @article{Levison:1994
   	Year = 1994, 
    Month = mar, 
    Volume = 108, 
-   DOI =  {https://doi.org/10.1006/icar.1994.1039},
+   DOI =  {10.1006/icar.1994.1039},
    url = {https://www.sciencedirect.com/science/article/pii/S0019103584710396?via%3Dihub}
 }
 
@@ -16,7 +16,7 @@ @article{Duncan:1998
   	Year = 1998, 
    Month = oct, 
    Volume = 116, 
-   DOI =  {https://doi.org/10.1086/300541},
+   DOI =  {10.1086/300541},
    url = {https://iopscience.iop.org/article/10.1086/300541}
 }
 
@@ -27,6 +27,6 @@ @article{Leinhardt:2012
   	Year = 2012, 
    Month = dec, 
    Volume = 745, 
-   DOI =  {https://doi.org/10.1088/0004-637X/745/1/79},
+   DOI =  {10.1088/0004-637X/745/1/79},
    url = {https://iopscience.iop.org/article/10.1088/0004-637X/745/1/79}
 }