https://hal-imt.archives-ouvertes.fr/hal-00479543 Contributor : Admin Télécom ParistechConnect in order to contact the contributor Submitted on : Friday, April 30, 2010 - 8:14:48 PM Last modification on : Friday, July 31, 2020 - 10:44:07 AM Long-term archiving on: : Thursday, September 30, 2010 - 4:55:45 PM