https://hal.ird.fr/ird-01625916 Contributor : Francine DelmasConnect in order to contact the contributor Submitted on : Sunday, October 29, 2017 - 9:54:48 PM Last modification on : Friday, April 29, 2022 - 10:13:09 AM Long-term archiving on: : Tuesday, January 30, 2018 - 12:26:57 PM