https://cel.archives-ouvertes.fr/cel-00653829 Contributor : Sylvie FloresConnect in order to contact the contributor Submitted on : Tuesday, December 20, 2011 - 1:07:20 PM Last modification on : Monday, December 13, 2021 - 9:15:08 AM Long-term archiving on: : Wednesday, March 21, 2012 - 2:31:55 AM