https://hal-univ-paris8.archives-ouvertes.fr/hal-01478224 Contributor : Jean-Noël LafargueConnect in order to contact the contributor Submitted on : Tuesday, February 28, 2017 - 5:37:54 AM Last modification on : Wednesday, April 28, 2021 - 6:38:26 PM Long-term archiving on: : Monday, May 29, 2017 - 12:54:27 PM