diff --git a/paper.bib b/paper.bib
index 9667801a..4b47d367 100644
--- a/paper.bib
+++ b/paper.bib
@@ -5,7 +5,7 @@ @article{humphrey2023using
   pages={1--29},
   year={2023},
   publisher={Springer},
-  doi={doi.org/10.1007/s10712-022-09754-9},
+  doi={10.1007/s10712-022-09754-9},
 }
 
 
@@ -41,9 +41,8 @@ @misc{gravity-toolkit
   title        = {gravity-toolkit},
   author       = {Sutterley, Tyler},
   title = {GitHub - {Tsutterley}/gravity-toolkit: Python tools for obtaining and working with data from the {GRACE} and {GRACE} {Follow}-{On} missions},
-  howpublished = "\url{https://github.com/tsutterley/gravity-toolkit}",
   year         = 2023,
-  doi={doi.org/10.5281/zenodo.8075728},
+  doi={10.5281/zenodo.8075728},
 }
 
 
@@ -51,7 +50,7 @@ @article{vishwakarma2017understanding
   title={Understanding and repairing the signal damage due to filtering of mass change estimates from the GRACE satellite mission},
   author={Vishwakarma, Bramha Dutt},
   year={2017},
-  doi={dx.doi.org/10.18419/opus-9193},
+  doi={10.18419/opus-9193},
 }
 
 @article{vishwakarma2017data,
@@ -63,7 +62,7 @@ @article{vishwakarma2017data
   pages={9824--9844},
   year={2017},
   publisher={Wiley Online Library},
-  doi={doi.org/10.1002/2017WR021150},
+  doi={10.1002/2017WR021150},
 }
 
 
@@ -76,7 +75,7 @@ @article{wahr1998time
   pages={30205--30229},
   year={1998},
   publisher={Wiley Online Library},
-  doi={doi.org/10.1029/98JB02844},
+  doi={10.1029/98JB02844},
 }
 
 @article{wieczorek2018shtools,
@@ -88,5 +87,5 @@ @article{wieczorek2018shtools
   pages={2574--2592},
   year={2018},
   publisher={Wiley Online Library},
-  doi={doi.org/10.1029/2018GC007529},
+  doi={10.1029/2018GC007529},
 }
\ No newline at end of file