https://hal.inria.fr/hal-02045341 Contributor : Luca FoppianoConnect in order to contact the contributor Submitted on : Thursday, February 21, 2019 - 11:56:43 PM Last modification on : Friday, February 22, 2019 - 9:50:11 AM Long-term archiving on: : Wednesday, May 22, 2019 - 6:51:23 PM