https://halshs.archives-ouvertes.fr/halshs-02420669 Contributor : Evangelia AdamouConnect in order to contact the contributor Submitted on : Friday, December 20, 2019 - 10:03:22 AM Last modification on : Thursday, October 21, 2021 - 5:05:33 AM Long-term archiving on: : Saturday, March 21, 2020 - 2:16:13 PM