https://hal.univ-lorraine.fr/hal-03218057 Contributor : Inoussa Kora ChabiConnect in order to contact the contributor Submitted on : Wednesday, May 5, 2021 - 12:06:48 PM Last modification on : Thursday, May 6, 2021 - 3:34:23 AM Long-term archiving on: : Friday, August 6, 2021 - 6:34:43 PM