https://cel.archives-ouvertes.fr/cel-00652692 Contributor : Sylvie FloresConnect in order to contact the contributor Submitted on : Friday, December 16, 2011 - 9:48:50 AM Last modification on : Thursday, December 16, 2021 - 2:10:28 PM Long-term archiving on: : Saturday, March 17, 2012 - 2:30:52 AM