https://cel.archives-ouvertes.fr/cel-00439723 Contributor : Ariane RollandConnect in order to contact the contributor Submitted on : Tuesday, December 8, 2009 - 2:31:56 PM Last modification on : Wednesday, November 24, 2021 - 9:54:07 AM Long-term archiving on: : Saturday, November 26, 2016 - 4:58:33 PM