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https://hal.archives-ouvertes.fr/jpa-00204277 Contributor : Archives Journal de PhysiqueConnect in order to contact the contributor Submitted on : Saturday, January 1, 1921 - 8:00:00 AM Last modification on : Saturday, January 1, 1921 - 8:00:00 AM Long-term archiving on: : Tuesday, April 13, 2010 - 5:13:28 PM