https://hal-amu.archives-ouvertes.fr/hal-01791497 Contributor : Jean-Louis BallaisConnect in order to contact the contributor Submitted on : Monday, May 14, 2018 - 4:25:37 PM Last modification on : Tuesday, December 7, 2021 - 4:05:10 PM Long-term archiving on: : Tuesday, September 25, 2018 - 12:00:43 PM