https://cel.archives-ouvertes.fr/cel-00549750 Contributor : Jean-Jacques MarigoConnect in order to contact the contributor Submitted on : Friday, July 13, 2012 - 1:42:13 PM Last modification on : Wednesday, November 17, 2021 - 12:28:05 PM Long-term archiving on: : Friday, March 31, 2017 - 10:44:26 AM