Fix a reference entry.

diff --git a/doc/doxygen/references.bib b/doc/doxygen/references.bib
index 5911337e85e957a8cd5ac83720b809bf072f72df..1955584265fd6808b237130cca587ede68d8c31d 100644 (file)
--- 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},