https://cel.archives-ouvertes.fr/cel-00652719 Contributor : Sylvie FloresConnect in order to contact the contributor Submitted on : Friday, December 16, 2011 - 10:23:16 AM Last modification on : Tuesday, October 19, 2021 - 11:33:55 PM Long-term archiving on: : Saturday, March 17, 2012 - 2:36:37 AM