https://hal-amu.archives-ouvertes.fr/hal-01790941 Contributor : Claude TouzetConnect in order to contact the contributor Submitted on : Monday, May 14, 2018 - 10:57:17 AM Last modification on : Wednesday, November 3, 2021 - 5:49:49 AM Long-term archiving on: : Monday, September 24, 2018 - 3:27:38 PM