http://hal.in2p3.fr/in2p3-00019962 Contributor : Michel LionConnect in order to contact the contributor Submitted on : Thursday, April 23, 2009 - 8:52:20 AM Last modification on : Tuesday, May 10, 2022 - 3:44:04 PM Long-term archiving on: : Monday, September 10, 2012 - 6:11:05 PM