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--- a/src/python/doc/alpha_complex_user.rst
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@@ -11,7 +11,8 @@ Definition
`AlphaComplex` is constructing a :doc:`SimplexTree <simplex_tree_ref>` using
`Delaunay Triangulation <http://doc.cgal.org/latest/Triangulation/index.html#Chapter_Triangulations>`_
-from `CGAL <http://www.cgal.org/>`_ (the Computational Geometry Algorithms Library).
+:cite:`cgal:hdj-t-19b` from `CGAL <http://www.cgal.org/>`_ (the Computational Geometry Algorithms Library
+:cite:`cgal:eb-19b`).
Remarks
^^^^^^^