https://hal.archives-ouvertes.fr/hal-01837210 Contributor : Isabelle FrechonConnect in order to contact the contributor Submitted on : Thursday, July 12, 2018 - 5:51:17 PM Last modification on : Wednesday, November 3, 2021 - 6:03:52 AM Long-term archiving on: : Monday, October 15, 2018 - 6:45:46 PM