diff --git a/Articles_essentiels.bib b/Articles_essentiels.bib
index 84ce71d..02710fb 100644
--- a/Articles_essentiels.bib
+++ b/Articles_essentiels.bib
@@ -165,6 +165,18 @@
 
 @comment {L}
 
+@article{li_comprehensive_2021,
+  title={A comprehensive review study of cyber-attacks and cyber security; {Emerging} trends and recent developments},
+  author={Li, Yuchong and Liu, Qinghui},
+  journal={Energy Reports},
+  volume={7},
+  issn = {2352-4847},
+  url = {https://www.sciencedirect.com/science/article/pii/S2352484721007289},
+  doi = {10.1016/j.egyr.2021.08.126},
+  year={2021},
+note = {Une revue de littérature définissant les concepts clés de la cyberdéfense (cyberattaque, cybersécurité, etc.)}
+}
+
 @article{libicki2012cyberspace,
   title={Cyberspace is not a warfighting domain},
   author={Libicki, Martin C},
@@ -321,6 +333,7 @@
 
 @comment {X}
 @comment {Y}
+
 @comment {Z}