https://cel.archives-ouvertes.fr/cel-00092970 Contributor : Administrateur de CelConnect in order to contact the contributor Submitted on : Tuesday, September 12, 2006 - 3:27:55 PM Last modification on : Wednesday, May 11, 2022 - 3:48:14 AM Long-term archiving on: : Monday, April 5, 2010 - 11:39:18 PM