https://cel.archives-ouvertes.fr/cel-00439562 Contributor : Nils BerglundConnect in order to contact the contributor Submitted on : Tuesday, December 31, 2013 - 11:04:00 AM Last modification on : Tuesday, January 11, 2022 - 5:56:05 PM Long-term archiving on: : Monday, March 31, 2014 - 10:06:51 PM