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• Universit´e de Sherbrooke Boul. de l’universit´e, J1K 2R1 Sherbrooke QC, Canada. e-mail: Jean-Philippe.Burelle@USherbrooke.ca Gr´egoire Dupont Institut de Math´ematiques de Jussieu – Paris Rive Gauche Universit´e Denis Diderot – Paris 7 rue du chevaleret Paris, France. e-mail: dupontg@math.jussieu.fr