https://hal-normandie-univ.archives-ouvertes.fr/hal-02269297 Contributor : Sandy MzembabaConnect in order to contact the contributor Submitted on : Thursday, August 22, 2019 - 3:54:56 PM Last modification on : Wednesday, March 2, 2022 - 4:18:04 PM Long-term archiving on: : Saturday, January 11, 2020 - 1:21:14 AM