https://hal-univ-perp.archives-ouvertes.fr/hal-02459359 Contributor : Sonja BöttgerConnect in order to contact the contributor Submitted on : Wednesday, January 29, 2020 - 12:53:41 PM Last modification on : Tuesday, December 8, 2020 - 1:18:52 PM Long-term archiving on: : Thursday, April 30, 2020 - 4:35:01 PM