Affiliation: | Laboratoire Kastler Brossel, Universite Pierre et Marie Curie, Case 74, 75252 PARIS cedex 05, France, FR Institut für Theoretische Physik, Universit?t Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria, AT INFM, Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy, IT
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