https://cel.archives-ouvertes.fr/cel-00520586 Contributor : Nicolas FressengeasConnect in order to contact the contributor Submitted on : Thursday, September 23, 2010 - 4:45:57 PM Last modification on : Sunday, June 5, 2022 - 7:06:06 PM Long-term archiving on: : Thursday, October 25, 2012 - 11:25:30 AM