https://cel.archives-ouvertes.fr/hal-02886843 Contributor : Ulysse DelabreConnect in order to contact the contributor Submitted on : Wednesday, July 1, 2020 - 7:22:55 PM Last modification on : Tuesday, January 4, 2022 - 6:19:25 AM Long-term archiving on: : Friday, October 2, 2020 - 5:32:51 PM