https://cel.archives-ouvertes.fr/cel-00092950 Contributor : Administrateur de CelConnect in order to contact the contributor Submitted on : Tuesday, September 12, 2006 - 3:26:23 PM Last modification on : Tuesday, April 12, 2022 - 1:30:05 PM Long-term archiving on: : Monday, April 5, 2010 - 10:47:59 PM