https://hal.univ-rennes2.fr/hal-01630110 Contributor : Laurence LerouxConnect in order to contact the contributor Submitted on : Monday, November 13, 2017 - 5:27:01 PM Last modification on : Thursday, April 22, 2021 - 3:11:59 AM Long-term archiving on: : Wednesday, February 14, 2018 - 12:32:54 PM