Institution: | 1. University of Birmingham, B15 2TT, Birmingham, UK 2. European Organization for Nuclear Research, CERN, CH-1211, Geneva 23, Switzerland 3. Imperial College of Science and Technology, SW7 2AZ, London, UK 4. Max-Planck-Institut für Physik und Astrophysik, D-8000, München, Federal Republic of Germany 5. Department of Nuclear Physics, OX1 3RH, Oxford, UK
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