https://hal.inria.fr/inria-00075494 Contributor : Rapport de Recherche InriaConnect in order to contact the contributor Submitted on : Wednesday, May 24, 2006 - 6:20:22 PM Last modification on : Friday, February 4, 2022 - 3:12:10 AM Long-term archiving on: : Tuesday, April 12, 2011 - 11:21:26 PM