https://hal.inria.fr/hal-00654435 Contributor : Denis RoegelConnect in order to contact the contributor Submitted on : Wednesday, December 21, 2011 - 7:53:46 PM Last modification on : Friday, February 26, 2021 - 3:28:08 PM Long-term archiving on: : Monday, November 19, 2012 - 10:55:26 AM