https://dumas.ccsd.cnrs.fr/dumas-00906675 Contributor : ESPE LNFConnect in order to contact the contributor Submitted on : Wednesday, November 20, 2013 - 10:47:36 AM Last modification on : Wednesday, February 23, 2022 - 1:28:06 PM Long-term archiving on: : Friday, February 21, 2014 - 4:25:36 AM