Institution: | 1. Physik-Department, Technische Universit?t München, Garching, Federal Republic of Germany 2. Institut für Strahlen- und Kernphysik, Universit?t Bonn, Bonn, Federal Republic of Germany 3. Centre de Recherches Nucléaires, Strasbourg, France 4. Tata Institute of Fundamental Research, Bombay, India
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