https://hal-sfo.ccsd.cnrs.fr/sfo-00260684 Contributor : Gérard RebmannConnect in order to contact the contributor Submitted on : Tuesday, March 4, 2008 - 5:11:20 PM Last modification on : Thursday, March 17, 2022 - 10:08:14 AM Long-term archiving on: : Thursday, May 20, 2010 - 7:19:00 PM