https://halshs.archives-ouvertes.fr/halshs-01697489 Contributor : Nicolas LebourgConnect in order to contact the contributor Submitted on : Wednesday, January 31, 2018 - 12:06:29 PM Last modification on : Wednesday, November 3, 2021 - 7:53:00 AM Long-term archiving on: : Friday, May 25, 2018 - 6:13:11 PM