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2. P. Villemoes: CERN Yellow Report 66-4.
3. V. Alles-Borelli, B. French, Å. Frisk andL. Michejda: CERN/TC/PHYSICS 66-6, to be published.
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5. R. K. Böck, W. A. Cooper, B. R. French J. B. Kinson, R. Levi-Setti, D. Revel, B. Tallini andS. Zylberajch:Phys. Lett.,17, 166 (1965), and private communications from the authors.