https://hal.univ-rennes2.fr/hal-02420214 Contributor : Laurence LerouxConnect in order to contact the contributor Submitted on : Thursday, December 19, 2019 - 5:29:45 PM Last modification on : Monday, December 13, 2021 - 12:03:04 PM Long-term archiving on: : Friday, March 20, 2020 - 8:57:12 PM