diff --git a/doc/references.bib b/doc/references.bib
--- a/doc/references.bib
+++ b/doc/references.bib
@@ -297,5 +297,18 @@
   school =       {University College},
   address =      {Dublin, Ireland},
   year =         1991,
-  month =        sep,
+  month =        sep
 }
+
+%%%%% Other algorithms %%%%%
+
+@article{grosso08maxclique,
+  author =       {Andrea Grosso and Marco Locatelli and Wayne Pullan},
+  title =        {Simple ingredients leading to very efficient
+                  heuristics for the maximum clique problem},
+  journal =      {Journal of Heuristics},
+  year =         2008,
+  volume =       14,
+  number =       6,
+  pages =        {587--612}
+}