https://hal-sfo.ccsd.cnrs.fr/sfo-00658672 Contributor : Saïda GuellatiConnect in order to contact the contributor Submitted on : Tuesday, January 10, 2012 - 9:42:06 PM Last modification on : Saturday, June 25, 2022 - 8:51:26 PM Long-term archiving on: : Wednesday, April 11, 2012 - 2:35:08 AM