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UNIV RENNES, CNRS, IRMAR - UMR 6625, F-35000 RENNES, FRANCE

Email address: Remi.Carles@math.cnrs.fr

UNIV. LILLE, INRIA, CNRS, UMR 8524, LABORATOIRE PAUL PAINLEVÉ, F-59000 LILLE, FRANCE

Email address: guillaume.ferriere@inria.fr