https://cel.archives-ouvertes.fr/cel-00963624 Contributor : Cimpa CimpaConnect in order to contact the contributor Submitted on : Friday, March 21, 2014 - 3:44:52 PM Last modification on : Thursday, February 24, 2022 - 1:38:03 PM Long-term archiving on: : Saturday, June 21, 2014 - 11:55:41 AM