https://cel.archives-ouvertes.fr/cel-00963668 Contributor : Cimpa CimpaConnect in order to contact the contributor Submitted on : Friday, March 21, 2014 - 4:27:36 PM Last modification on : Friday, October 22, 2021 - 3:31:08 AM Long-term archiving on: : Saturday, June 21, 2014 - 12:05:49 PM