https://cel.archives-ouvertes.fr/cel-00697806 Contributor : Jean-Michel GénevauxConnect in order to contact the contributor Submitted on : Thursday, February 20, 2020 - 4:20:15 PM Last modification on : Tuesday, February 25, 2020 - 1:32:18 AM Long-term archiving on: : Thursday, May 21, 2020 - 4:53:00 PM