J. Dolbeault. Extremal functions and symmetry breaking in Caffarelli-Kohn-Nirenberg inequalities. In Oberwolfach reports 08/2010, editor, Optimal Constants in the Theory of Sobolev Spaces and PDEs, volume 7, pages 330-334. Organised by Andrea Cianchi, Firenze Maria J. Esteban, Paris Bernd Kawohl, K ̈oln, European Mathematical Society, 2010