Affiliation: | 1. Institute Laue Langevin, F-38042, Grenoble, France 2. Physik-Department, Technische Universit?t München, W-8046, Garching, Germany 3. Tennessee Technical University, 38505, Cookville, TN, USA 4. Department of Physics, University of Zagreb, YU-41000, Zagreb, Croatia, Yugoslavia
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