Affiliation: | a Département de Mathématiques, Batiment 425, Université Paris-Sud, F-91405 Orsay, Cedex, France b Laboratoire Analyse, Géométrie & Applications, UMR 7539, Institut Galilée, Université Paris 13, 99 avenue J.B. Clément, F-93430 Villetaneuse, France c Department of Mathematics, Princeton University, Princeton, NJ 08544, USA d Department of Mathematics Hill Center, Rutgers, The State University of New Jersey, Busch Campus, 110 Frelinghuysen Road, Piscataway, NJ 08854-8019, USA |