https://hal-polytechnique.archives-ouvertes.fr/hal-01020626 Contributor : Denis RouraConnect in order to contact the contributor Submitted on : Tuesday, July 8, 2014 - 12:50:33 PM Last modification on : Tuesday, December 7, 2021 - 10:58:03 AM Long-term archiving on: : Wednesday, October 8, 2014 - 1:25:19 PM