https://hal-ifp.archives-ouvertes.fr/hal-02475564 Contributor : Jean KittelConnect in order to contact the contributor Submitted on : Wednesday, February 12, 2020 - 10:27:23 AM Last modification on : Thursday, February 13, 2020 - 6:25:24 PM Long-term archiving on: : Wednesday, May 13, 2020 - 2:10:41 PM