https://hal-sfo.ccsd.cnrs.fr/sfo-00319203 Contributor : Agnes MaitreConnect in order to contact the contributor Submitted on : Saturday, September 6, 2008 - 1:40:04 AM Last modification on : Saturday, January 15, 2022 - 3:43:48 AM Long-term archiving on: : Thursday, June 3, 2010 - 8:07:59 PM