From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Fri, 26 Jun 2020 03:09:35 +0000 (-0600)
Subject: Fix a reference entry.
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Fix a reference entry.
---

diff --git a/doc/doxygen/references.bib b/doc/doxygen/references.bib
index 5911337e85..1955584265 100644
--- a/doc/doxygen/references.bib
+++ b/doc/doxygen/references.bib
@@ -786,7 +786,6 @@ year = {2008},
   doi = {10.1029/2018gc007508},
   url = {https://doi.org/10.1029/2018gc007508},
   year = {2018},
-  month = sep,
   publisher = {American Geophysical Union ({AGU})},
   volume = {19},
   number = {9},