https://cel.archives-ouvertes.fr/cel-00092966 Contributor : Administrateur de CelConnect in order to contact the contributor Submitted on : Tuesday, September 12, 2006 - 3:27:51 PM Last modification on : Friday, December 11, 2020 - 8:28:04 AM Long-term archiving on: : Friday, May 13, 2011 - 11:50:04 PM