https://hal-mines-paristech.archives-ouvertes.fr/hal-00707832 Contributor : Anne-Françoise SchmidConnect in order to contact the contributor Submitted on : Friday, June 29, 2012 - 5:40:27 PM Last modification on : Wednesday, November 17, 2021 - 12:31:12 PM Long-term archiving on: : Sunday, September 30, 2012 - 2:20:25 AM