https://cel.archives-ouvertes.fr/cel-00781473 Contributor : Jean-Marie MalherbeConnect in order to contact the contributor Submitted on : Sunday, January 27, 2013 - 9:45:59 AM Last modification on : Wednesday, November 17, 2021 - 12:30:20 PM Long-term archiving on: : Sunday, April 28, 2013 - 3:05:09 AM