https://hal-lara.archives-ouvertes.fr/hal-01357087 Contributor : Colette ORANGEConnect in order to contact the contributor Submitted on : Monday, August 29, 2016 - 10:33:22 AM Last modification on : Friday, October 23, 2020 - 4:34:40 PM Long-term archiving on: : Wednesday, November 30, 2016 - 12:43:59 PM