https://cel.archives-ouvertes.fr/cel-02291510 Contributor : Cyril ButtayConnect in order to contact the contributor Submitted on : Wednesday, September 18, 2019 - 10:06:16 PM Last modification on : Monday, September 13, 2021 - 2:44:04 PM Long-term archiving on: : Saturday, February 8, 2020 - 11:55:09 PM