https://hal.univ-rennes2.fr/hal-02292086 Contributor : Laurence LerouxConnect in order to contact the contributor Submitted on : Thursday, September 19, 2019 - 2:02:35 PM Last modification on : Monday, December 13, 2021 - 12:02:14 PM Long-term archiving on: : Saturday, February 8, 2020 - 11:50:22 PM