https://hal.archives-ouvertes.fr/hal-00653017 Contributor : CCSD Sciencesconf.orgConnect in order to contact the contributor Submitted on : Friday, December 16, 2011 - 5:23:50 PM Last modification on : Monday, April 4, 2022 - 6:30:37 PM Long-term archiving on: : Monday, December 5, 2016 - 12:18:52 AM