https://cel.archives-ouvertes.fr/cel-00655005 Contributor : David FilliatConnect in order to contact the contributor Submitted on : Saturday, December 24, 2011 - 3:56:07 PM Last modification on : Wednesday, May 11, 2022 - 12:06:05 PM Long-term archiving on: : Monday, December 5, 2016 - 6:13:06 AM