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L. Sylvain-delattre, C. De-probabilités-et-modèles-aléatoires, and . Cnrs-umr, Case courrier 7012, avenue de France, 75205 Paris Cedex 13, France. E-mail address: sylvain.delattre@univ-paris-diderot.fr Nicolas Fournier, Laboratoire de Probabilités et Modèles Aléatoires E-mail address: nicolas.fournier@upmc