https://cel.archives-ouvertes.fr/cel-00439764 Contributor : Ariane RollandConnect in order to contact the contributor Submitted on : Tuesday, December 8, 2009 - 3:07:31 PM Last modification on : Wednesday, December 9, 2020 - 3:13:15 PM Long-term archiving on: : Saturday, November 26, 2016 - 4:39:02 PM