https://hal.univ-lorraine.fr/hal-01732893 Contributor : Colette ORANGEConnect in order to contact the contributor Submitted on : Wednesday, March 14, 2018 - 3:24:23 PM Last modification on : Sunday, June 26, 2022 - 2:30:28 AM Long-term archiving on: : Tuesday, September 4, 2018 - 7:21:49 PM