Abstract
Submitted on 20 Mar 2015HAL is a multi-disciplinary open accessarchive for the deposit and dissemination of sci-enti c research documents, whether they are pub-lished or not. The documents may come fromteaching and research institutions in France orabroad, or from public or private research centers.L’archive ouverte pluridisciplinaire HAL, estdestinee au dep^ot et a la di usion de documentsscienti ques de niveau recherche, publies ou non,emanant des etablissements d’enseignement et derecherche fran˘cais ou etrangers, des laboratoirespublics ou prives.
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