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. Laboratoire-de-mathématiques-et-modélisation-d-'evry, Université d'Evry-Val d'Essonne, F-91037 Evry Cedex. Email : christophe.profeta@univ-evry, 59655 Villeneuve d'Ascq Cedex and Laboratoire de physique théorique et modèles statistiques, p.91405

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