Affiliation: | 1. Institute for High Energy Physics, DDR-1615, Berlin-Zeuthen, GDR 2. Central-Research Institute for Physiks, H-1088, Budapest, Hungary 3. Joint Institute for Nuclear Research, SU-141980, Dubna, USSR 4. Institute of Physics of Charles University, CS-18000, Prague, CSSR 5. Institute for Nuclear Research, Sofia, Bulgaria 6. Institute of Physics, SU-380086, Tbilisi, USSR 7. Institute of Experimental Physics, Warsaw University, PL-00681, Warsaw, Poland
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