https://hal.inria.fr/hal-00868939 Contributor : Estelle NivaultConnect in order to contact the contributor Submitted on : Wednesday, October 2, 2013 - 11:24:05 AM Last modification on : Wednesday, November 29, 2017 - 10:06:01 AM Long-term archiving on: : Friday, January 3, 2014 - 7:10:33 AM