https://cel.archives-ouvertes.fr/cel-00677782 Contributor : Philippe LambertConnect in order to contact the contributor Submitted on : Friday, March 9, 2012 - 4:14:02 PM Last modification on : Wednesday, December 22, 2021 - 10:18:02 AM Long-term archiving on: : Thursday, June 14, 2012 - 5:40:41 PM