http://hal.in2p3.fr/in2p3-00023433 Contributor : Jeanine PelletConnect in order to contact the contributor Submitted on : Monday, December 13, 2004 - 5:50:26 PM Last modification on : Thursday, December 16, 2021 - 2:10:23 PM Long-term archiving on: : Thursday, April 1, 2010 - 4:05:35 PM