https://hal-normandie-univ.archives-ouvertes.fr/hal-03252840 Contributor : Brice Arsène MankouConnect in order to contact the contributor Submitted on : Monday, June 7, 2021 - 11:43:59 PM Last modification on : Wednesday, March 2, 2022 - 5:06:02 PM Long-term archiving on: : Wednesday, September 8, 2021 - 7:58:32 PM