https://halshs.archives-ouvertes.fr/halshs-01631700 Contributor : Guy LecuyotConnect in order to contact the contributor Submitted on : Monday, March 5, 2018 - 4:36:01 PM Last modification on : Thursday, March 17, 2022 - 10:30:04 AM Long-term archiving on: : Wednesday, June 6, 2018 - 4:16:53 PM