https://hal-sfo.ccsd.cnrs.fr/sfo-00260709 Contributor : Gérard RebmannConnect in order to contact the contributor Submitted on : Tuesday, March 4, 2008 - 5:57:30 PM Last modification on : Thursday, March 17, 2022 - 10:08:14 AM Long-term archiving on: : Thursday, May 20, 2010 - 11:55:17 PM