https://hal-univ-pau.archives-ouvertes.fr/hal-02320226 Contributor : Jean Pierre JambesConnect in order to contact the contributor Submitted on : Friday, October 18, 2019 - 3:16:02 PM Last modification on : Sunday, June 26, 2022 - 2:04:45 AM Long-term archiving on: : Sunday, January 19, 2020 - 3:17:23 PM