https://cel.archives-ouvertes.fr/cel-00644403 Contributor : Sylvie FloresConnect in order to contact the contributor Submitted on : Thursday, November 24, 2011 - 1:53:31 PM Last modification on : Monday, March 28, 2022 - 10:44:05 AM Long-term archiving on: : Saturday, February 25, 2012 - 2:28:02 AM