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DOI : 10.1007/978-3-662-06400-9

R. Abraham, M. Université-d-'orléans, and B. P. , 45067 Orléans cedex 2 France E-mail address: romain.abraham@univ-orleans.fr Jean-François Delmas, ENPC-CERMICS, 6-8 av, p.77455