https://hal.inria.fr/inria-00070032 Contributor : Rapport de Recherche InriaConnect in order to contact the contributor Submitted on : Friday, May 19, 2006 - 6:51:54 PM Last modification on : Friday, February 4, 2022 - 3:16:11 AM Long-term archiving on: : Sunday, April 4, 2010 - 8:18:17 PM