https://hal.univ-rennes2.fr/hal-01778485 Contributor : Laurence LerouxConnect in order to contact the contributor Submitted on : Wednesday, April 25, 2018 - 5:05:43 PM Last modification on : Monday, December 13, 2021 - 12:02:18 PM Long-term archiving on: : Tuesday, September 25, 2018 - 7:41:04 AM