diff --git a/doc/references.bib b/doc/references.bib
index 69365c757f6..3b92a1a244e 100644
--- a/doc/references.bib
+++ b/doc/references.bib
@@ -175,6 +175,17 @@ @article{BrookesEtAl2008
   year = {2008}
 }
 
+@article{bruna2018phase,
+  title={Phase locking value revisited: teaching new tricks to an old dog},
+  author={Bru{\~n}a, Ricardo and Maest{\'u}, Fernando and Pereda, Ernesto},
+  journal={Journal of neural engineering},
+  volume={15},
+  number={5},
+  pages={056011},
+  year={2018},
+  publisher={IOP Publishing}
+}
+
 @article{CamposViolaEtAl2009,
   author = {Campos Viola, Filipa and Thorne, Jeremy and Edmonds, Barrie and Schneider, Till and Eichele, Tom and Debener, Stefan},
   doi = {10.1016/j.clinph.2009.01.015},