https://hal.inria.fr/inria-00177890 Contributor : Alain MonteilConnect in order to contact the contributor Submitted on : Tuesday, October 9, 2007 - 3:33:09 PM Last modification on : Friday, September 16, 2016 - 3:18:00 PM Long-term archiving on: : Sunday, April 11, 2010 - 10:35:15 PM