https://dumas.ccsd.cnrs.fr/dumas-02293423 Contributor : Nîmes UniversitéConnect in order to contact the contributor Submitted on : Friday, September 20, 2019 - 6:27:52 PM Last modification on : Friday, November 22, 2019 - 5:17:03 PM Long-term archiving on: : Sunday, February 9, 2020 - 3:11:47 AM