https://hal-cnrs.archives-ouvertes.fr/hal-02363196 Contributor : Sabine PetitConnect in order to contact the contributor Submitted on : Wednesday, December 2, 2020 - 9:25:38 PM Last modification on : Tuesday, January 4, 2022 - 6:06:39 AM Long-term archiving on: : Wednesday, March 3, 2021 - 8:20:50 PM