https://hal-insu.archives-ouvertes.fr/insu-00904958 Contributor : Pascale TalourConnect in order to contact the contributor Submitted on : Friday, November 15, 2013 - 3:51:00 PM Last modification on : Monday, November 18, 2013 - 3:53:51 PM Long-term archiving on: : Sunday, February 16, 2014 - 5:10:10 AM