https://halshs.archives-ouvertes.fr/halshs-01924283 Contributor : Claudio VitariConnect in order to contact the contributor Submitted on : Saturday, November 17, 2018 - 8:50:59 AM Last modification on : Thursday, December 9, 2021 - 4:26:04 PM Long-term archiving on: : Monday, February 18, 2019 - 12:48:26 PM