https://hal-amu.archives-ouvertes.fr/hal-02397001 Contributor : Nicole IsnardonConnect in order to contact the contributor Submitted on : Tuesday, December 10, 2019 - 1:32:28 PM Last modification on : Thursday, May 12, 2022 - 9:30:06 AM Long-term archiving on: : Wednesday, March 11, 2020 - 6:19:09 PM