Fix bibtex warning for empty journal

diff --git a/9.5/paper.bib b/9.5/paper.bib
index 7dc8023dbfeb7a85b1280ffe178c80b156a77714..d462c30140145ad6c94be6260f06c1705c4ceb23 100644 (file)
--- a/9.5/paper.bib
+++ b/9.5/paper.bib
@@ -1548,6 +1548,7 @@ See: https://doc.cgal.org/latest/Manual/how_to_cite_cgal.html
 @article{phillips2021auto,
   title={Auto-Tuned Preconditioners for the Spectral Element Method on GPUs},
   author={Phillips, Malachi and Kerkemeier, Stefan and Fischer, Paul},
+  journal={arXiv preprint arXiv:2110.07663},
   year={2021}
 }