https://cel.archives-ouvertes.fr/cel-00092940 Contributor : Administrateur de CelConnect in order to contact the contributor Submitted on : Tuesday, September 12, 2006 - 3:25:23 PM Last modification on : Saturday, March 28, 2020 - 2:17:34 AM Long-term archiving on: : Tuesday, April 6, 2010 - 12:54:22 AM