https://hal-univ-paris.archives-ouvertes.fr/cel-01405718 Contributor : Christophe CosteConnect in order to contact the contributor Submitted on : Wednesday, November 30, 2016 - 12:20:40 PM Last modification on : Thursday, March 4, 2021 - 5:21:15 PM Long-term archiving on: : Monday, March 27, 2017 - 8:54:22 AM