https://hal.inria.fr/inria-00069961 Contributor : Rapport de Recherche InriaConnect in order to contact the contributor Submitted on : Friday, May 19, 2006 - 6:42:58 PM Last modification on : Friday, February 4, 2022 - 3:12:27 AM Long-term archiving on: : Sunday, April 4, 2010 - 7:57:20 PM