https://halshs.archives-ouvertes.fr/halshs-01802472 Contributor : Serge ThibaultConnect in order to contact the contributor Submitted on : Tuesday, May 29, 2018 - 12:28:55 PM Last modification on : Tuesday, January 11, 2022 - 5:56:21 PM Long-term archiving on: : Thursday, August 30, 2018 - 2:18:21 PM