diff --git a/Packages/Manual/doc_tex/cgal_manual.bib b/Packages/Manual/doc_tex/cgal_manual.bib
index 0d781ee41f2..e6af7dd9ca6 100644
--- a/Packages/Manual/doc_tex/cgal_manual.bib
+++ b/Packages/Manual/doc_tex/cgal_manual.bib
@@ -380,6 +380,16 @@
   ,pages        = "562--573"
 }                
                                   
+@article{ cgal:hp-isr-02
+  , author      = "D. Halperin and E. Packer"
+  , title       = "Iterated Snap Rounding"
+  , journal     = "Computational Geometry: Theory and Applications"
+  , volume      = 23
+  , number      = 2
+  , year        = 2002
+  , pages       = "209--225"
+} 
+
 @book{ cgal:hw-vrml2h-96
   ,author       = {Jed Hartman and Josie Wernecke}
   ,title        = {The {VRML} 2.0 Handbook: Building Moving Worlds on the