https://hal.inria.fr/inria-00073987 Contributor : Rapport de Recherche InriaConnect in order to contact the contributor Submitted on : Wednesday, May 24, 2006 - 2:14:58 PM Last modification on : Friday, February 4, 2022 - 3:24:10 AM Long-term archiving on: : Sunday, April 4, 2010 - 9:36:21 PM