diff --git a/publications.md b/publications.md
index 69ef8a9..1d352e7 100644
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 ### Graph Programs and the Language GP 2
 
 * G. Campbell, B. Courtehoute and D. Plump
-  [Fast Rule-Based Graph Programs]
+  [Fast Rule-Based Graph Programs](10.1016/j.scico.2021.102727)
   _Science of Computer Programming_ 214, Elsevier, 2022.
   doi: [10.1016/j.scico.2021.102727]