https://hal-amu.archives-ouvertes.fr/cel-01367720 Contributor : Boris BarraudConnect in order to contact the contributor Submitted on : Friday, September 16, 2016 - 3:39:27 PM Last modification on : Friday, October 22, 2021 - 3:35:27 AM Long-term archiving on: : Saturday, December 17, 2016 - 2:52:36 PM