https://hal.univ-rennes2.fr/hal-01630122 Contributor : Laurence LerouxConnect in order to contact the contributor Submitted on : Wednesday, November 8, 2017 - 5:32:02 PM Last modification on : Thursday, April 22, 2021 - 3:11:59 AM Long-term archiving on: : Friday, February 9, 2018 - 12:20:28 PM