https://hal.univ-rennes2.fr/tel-02052753 Contributor : Laurence LerouxConnect in order to contact the contributor Submitted on : Thursday, February 28, 2019 - 4:31:33 PM Last modification on : Monday, December 13, 2021 - 12:03:02 PM Long-term archiving on: : Wednesday, May 29, 2019 - 6:21:54 PM