https://cel.archives-ouvertes.fr/cel-00648744 Contributor : Sylvie FloresConnect in order to contact the contributor Submitted on : Tuesday, December 6, 2011 - 1:17:25 PM Last modification on : Monday, March 28, 2022 - 10:44:05 AM Long-term archiving on: : Wednesday, March 7, 2012 - 2:45:59 AM