diff --git a/bib/sivanov-extra.bib b/bib/sivanov-extra.bib
index 9ea4051..8e11e13 100644
--- a/bib/sivanov-extra.bib
+++ b/bib/sivanov-extra.bib
@@ -1,6 +1,6 @@
 @inbook{NushiPSMICP2022,
 author = {Nushi, Elio and Popescu, Victor-Bogdan and Sanchez Martin, Jose-Angel and Ivanov, Sergiu and Czeizler, Eugen and Petre, Ion},
-publisher = {John Wiley & Sons, Ltd},
+publisher = {John Wiley \& Sons, Ltd},
 isbn = {9781119716600},
 title = {Network Modelling Methods for Precision Medicine},
 booktitle = {Systems Biology Modelling and Analysis},