https://cel.archives-ouvertes.fr/cel-00093001 Contributor : Administrateur de CelConnect in order to contact the contributor Submitted on : Tuesday, September 12, 2006 - 3:28:03 PM Last modification on : Wednesday, April 28, 2021 - 3:27:40 AM Long-term archiving on: : Thursday, September 20, 2012 - 10:26:03 AM