https://cel.archives-ouvertes.fr/cel-00092974 Contributor : Administrateur de CelConnect in order to contact the contributor Submitted on : Tuesday, September 12, 2006 - 3:28:00 PM Last modification on : Tuesday, January 11, 2022 - 5:56:08 PM Long-term archiving on: : Tuesday, April 6, 2010 - 12:54:44 AM