diff --git a/bib/sivanov-extra.bib b/bib/sivanov-extra.bib
index f6b25ce..1992389 100644
--- a/bib/sivanov-extra.bib
+++ b/bib/sivanov-extra.bib
@@ -1,3 +1,16 @@
+@article{C:AB20,
+author = {Urvan Christen and
+          Sergiu Ivanov and
+	  Rémi Segretain and
+	  Laurent Trilling and
+	  Nicolas Glade},
+title = {On Computing Structural and Behavioral Complexities of Threshold Boolean Networks},
+journal = {Acta Biotheoretica},
+volume = {68},
+pages = {119--138},
+year = {2020}
+}
+
 @techreport{AGIMPP2014,
 title = {Complexity of Model Checking for Reaction Systems},
 author = {Azimi, Sepinoud and Gratie, Cristian and Ivanov, Sergiu and Manzoni, Luca and Petre, Ion and Porreca, Antonio E.},