https://cel.archives-ouvertes.fr/cel-00439741 Contributor : Ariane RollandConnect in order to contact the contributor Submitted on : Tuesday, December 8, 2009 - 2:52:16 PM Last modification on : Tuesday, October 19, 2021 - 11:33:53 PM Long-term archiving on: : Saturday, November 26, 2016 - 4:54:46 PM