https://hal.inria.fr/inria-00070062 Contributor : Rapport de Recherche InriaConnect in order to contact the contributor Submitted on : Friday, May 19, 2006 - 6:58:20 PM Last modification on : Friday, February 4, 2022 - 3:22:02 AM Long-term archiving on: : Tuesday, February 22, 2011 - 11:14:08 AM