https://hal-univ-paris.archives-ouvertes.fr/hal-02120346 Contributor : Didier NativelConnect in order to contact the contributor Submitted on : Sunday, May 5, 2019 - 7:47:43 PM Last modification on : Tuesday, October 19, 2021 - 6:51:47 PM Long-term archiving on: : Tuesday, August 6, 2019 - 12:26:10 PM