1. K. Tanaka:Phys. Rev.,135, B 1186 (1964).
2. F. J. Dyson andN.-H. Xuong:Phys. Rev. Lett.,14, 654 (1965);
3. M. Konuma andE. Remiddi:Phys. Rev. Lett.,14, 1082 (1965).
4. F. Hussain andP. Rotelli:Phys. Rev.,142, 1013 (1966). See alsoP. Winternitz: Dubna E-2246.
5. R. Armenteros, L. Montanet, D. Morrison, S. Nilsson, A. Shapira, J. Vandermeulen, Ch. d'Andlau, A. Astier, J. Ballam, C. Ghesquière, B. Gergory, D. Rahm, P. Rivet andF. Solmitz:Proceedings of the International Conference on High-Energy Nuclear Physics, Geneva, 1962, edited byJ. Prentki (Geneva, 1962), p. 351. The data at 1.61 GeV/c are given inG. R. Lynch, Ph. Eberhard, G. R. Kalbfleisch, J. E. Lannutti, B. C. Maglić, J. B. Shafer, M. L. Stevenson, andNguyen-Huu Xuong:Phys. Rev.,131, 1287 (1963).