https://hal-amu.archives-ouvertes.fr/hal-02487062 Contributor : Françoise DianaConnect in order to contact the contributor Submitted on : Friday, February 21, 2020 - 1:19:21 PM Last modification on : Wednesday, November 3, 2021 - 4:40:59 AM Long-term archiving on: : Friday, May 22, 2020 - 5:02:47 PM