https://hal.inria.fr/inria-00074050 Contributor : Rapport de Recherche InriaConnect in order to contact the contributor Submitted on : Wednesday, May 24, 2006 - 2:23:29 PM Last modification on : Thursday, February 3, 2022 - 11:14:23 AM Long-term archiving on: : Thursday, March 24, 2011 - 2:01:48 PM