Institution: | (1) Département de Mathématiques, UQAM, CP 8888, Succ. Centre-ville, Montréal, Québec H3C 3P8, Canada;(2) Department of Mathematics and Statistics, University of Edinburgh, King's Building, Mayfield's Road, Edinburgh, EH9 3JZ, Scotland;(3) Centre de Mathématiques, École Polytechnique, UMR 7640 du CNRS, 91128 Palaiseau, France |