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E-Mail: amranesouad@yahoo.com E-Mail: fbedouhene@yahoo.fr (2) Laboratoire des Signaux et Systèmes, Islam.Boussaada@l2s.centralesupelec.fr E-Mail: Silviu.Niculescu@l2s.centralesupelec.fr (3) Inria Saclay?IleSaclay?Saclay?Ile-de, vol.41, pp.13414-13419, 2008. ,
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