https://hal.inria.fr/inria-00070078 Contributor : Rapport de Recherche InriaConnect in order to contact the contributor Submitted on : Friday, May 19, 2006 - 7:03:05 PM Last modification on : Friday, February 4, 2022 - 3:24:46 AM Long-term archiving on: : Tuesday, February 22, 2011 - 11:17:44 AM