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E. , D. L. Univ, U. R. Matematica, L. S. Tre, R. Murialdo-00146 et al., AQUILA, 1-67100 L'AQUILA, ITALY E-mail address: martin@mat.uniroma3.it DIP, -mail address: Cristina.Toninelli@lpt.ens.fr LABORATOIRE DE PROBABILITÉS ET MOD`MOD`ELES AL`AL`EATOIRES CNRS-UMR 7599 UNIVERSITÉS PARIS VI-VII 4, PLACE JUSSIEU F-75252 PARIS CEDEX 05 FRANCE