https://cel.archives-ouvertes.fr/cel-00559978 Contributor : Minh Ha-DuongConnect in order to contact the contributor Submitted on : Wednesday, January 26, 2011 - 7:12:03 PM Last modification on : Friday, October 8, 2021 - 4:26:40 PM Long-term archiving on: : Friday, December 2, 2016 - 1:34:55 PM