https://halshs.archives-ouvertes.fr/halshs-03039823 Contributor : Bertrand MüllerConnect in order to contact the contributor Submitted on : Friday, December 4, 2020 - 9:19:56 AM Last modification on : Thursday, March 17, 2022 - 10:08:39 AM Long-term archiving on: : Friday, March 5, 2021 - 6:18:54 PM