diff --git a/content/3.defense-systems/pd-t4-7.md b/content/3.defense-systems/pd-t4-7.md
index e19381633f0828b86a29556f9129ba5eccceb4db..39cb2c82627e8bb5b8a8915d5740f5ebdff93f2a 100644
--- a/content/3.defense-systems/pd-t4-7.md
+++ b/content/3.defense-systems/pd-t4-7.md
@@ -12,7 +12,7 @@ tableColumns:
 contributors:
     Ernest Mordret  
 relevantAbstracts:
-    doi: 10.1038/s41564-022-01219-4
+    - doi: 10.1038/s41564-022-01219-4
 ---
 
 # PD-T4-7