https://hal-ens-lyon.archives-ouvertes.fr/ensl-01957713 Contributor : Léo PoyetonConnect in order to contact the contributor Submitted on : Monday, December 17, 2018 - 3:08:36 PM Last modification on : Tuesday, November 19, 2019 - 12:36:51 PM Long-term archiving on: : Monday, March 18, 2019 - 3:22:22 PM