https://hal-normandie-univ.archives-ouvertes.fr/hal-02131780 Contributor : Sandy MzembabaConnect in order to contact the contributor Submitted on : Thursday, May 16, 2019 - 3:47:23 PM Last modification on : Wednesday, November 3, 2021 - 6:23:39 AM Long-term archiving on: : Monday, August 19, 2019 - 11:53:47 AM