Institution: | 1. Faculté des Sciences, Université de l'Etat à Mons, B-7000, Mons, Belgium 2. IHEP, Serpukhov, USSR 3. D. Ph. P. E. CEN-Saclay, F-91190, Gif-sur-Yvette, France 4. IHEP Akad. of Science of Kaz. SSR. Alma-Ata, USSR 5. Institute of Nuclear Research, Moscow University, Moscow, USSR 6. Interuniversity Institute for High Energies, ULB-VUB, B-1000, Brussels, Belgium
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