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HAL Id: hal-00089284 https://hal.science/hal-00089284 Submitted on 16 Aug 2006 HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci- entific research documents, whether they are pub- lished or not. The documents may come from teaching and research institutions in F rance or abroad, or from public or private research centers.L’archive ouverte pluridisciplinaire HAL , est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés