https://hal-univ-paris.archives-ouvertes.fr/hal-01378228 Contributor : FRANCOIS BRUNETConnect in order to contact the contributor Submitted on : Sunday, October 9, 2016 - 3:41:04 PM Last modification on : Saturday, June 25, 2022 - 8:57:28 PM Long-term archiving on: : Tuesday, January 10, 2017 - 12:13:22 PM