https://cel.archives-ouvertes.fr/cel-00343873
Contributor : Laurent Chusseau <>
Submitted on : Wednesday, December 3, 2008 - 1:35:51 AM Last modification on : Thursday, May 7, 2020 - 9:14:14 AM Long-term archiving on: : Thursday, October 11, 2012 - 12:31:30 PM