https://hal-univ-perp.archives-ouvertes.fr/hal-02445388 Contributor : Sonja BöttgerConnect in order to contact the contributor Submitted on : Monday, January 20, 2020 - 10:48:20 AM Last modification on : Thursday, January 23, 2020 - 1:40:48 AM Long-term archiving on: : Tuesday, April 21, 2020 - 2:56:16 PM