https://hal-amu.archives-ouvertes.fr/hal-01791458 Contributor : Jean-Louis BallaisConnect in order to contact the contributor Submitted on : Monday, May 14, 2018 - 4:15:46 PM Last modification on : Wednesday, February 16, 2022 - 4:01:22 PM Long-term archiving on: : Tuesday, September 25, 2018 - 4:56:28 AM