https://cel.archives-ouvertes.fr/cel-00682308 Contributor : Badr BenmammarConnect in order to contact the contributor Submitted on : Monday, March 26, 2012 - 11:07:38 AM Last modification on : Saturday, June 25, 2022 - 10:32:56 AM Long-term archiving on: : Wednesday, June 27, 2012 - 2:21:16 AM