https://hal.inria.fr/inria-00075260 Contributor : Rapport de Recherche InriaConnect in order to contact the contributor Submitted on : Wednesday, May 24, 2006 - 5:50:16 PM Last modification on : Friday, February 4, 2022 - 3:16:22 AM Long-term archiving on: : Tuesday, April 12, 2011 - 6:26:27 PM