1. G. Grayer et al.: inProceedings of the III Philadelphia Conference on Experimental Meson Spectroscopy, Philadelphia, 1972 (New York, N. Y., 1972).
2. R. Diebold: inProceedings of the II International Conference on Elementary Particles (Aix-en-Provence, 1973).
3. P. Estabrooks et al.: inProceedings of the Conference on π-π Scattering, Tallahasse, 1973 (New York, N. Y., 1973).
4. B. Hyams, C. Jones, P. Wellhammer, W. Blum, H. Dietl, G. Grayer, W. Koch, E. Lorentz, G. Lütjens, W. Mánner, J. Meissburger, W. Ochs, U. Stierlin andF. Wagner:Nucl. Phys.,64 B, 134 (1973).
5. L. J. Gutay andK. Vasavada:Phys. Lett.,46 B, 88 (1973).