https://cel.archives-ouvertes.fr/cel-01062802 Contributor : Christophe CoillotConnect in order to contact the contributor Submitted on : Wednesday, September 10, 2014 - 3:35:59 PM Last modification on : Friday, October 22, 2021 - 3:02:05 PM Long-term archiving on: : Thursday, December 11, 2014 - 2:36:45 PM