1. R. Armenteros, D. N. Edwards, T. Jacobsen, A. Shapira, J. Vandermeulen, Ch. D'Andlau, A. Astier, P. Baillon, H. Briand, J. Cohen-Ganouna, C. Defoix, J. Siaud, C. Chesquière andP. Rivet:Proc. Int. Conf. on Elementary Particles, vol.1 (Sienna, 1963), p. 296.
2. B. Buschbeck-Czapp, I. Wacek, W. A. Cooper, A. Fridman, E. Malamud, C. Otter, E. Gelsema andA. Tenner:Proc. Int. Conf. on Elementary Particles, Vol.1 (Sienna, 1963), p. 166.
3. R. Kraemer, L. Madansky, M. Meer, M. Nussbaum, A. Pevsner, C. Richardson, R. Strand, R. Zdanis, T. Fields, S. Orenstein andT. Toohig:Phys. Rev.,136, B 496 (1964).
4. D. C. Miller:The properties of ω and ϕ mesons, Nevis 131 (1965), thesis.
5. F. E. James andH. L. Kraybill:Phys. Rev.,142, 896 (1966).