1. M. Davier et al.: SLAC-PUB-666 (September, 1969);
2. G. McClellan, N. Mistry, P. Mostek, H. Ogren, A. Osborne, A. Silverman, J. Swartz, P. Talman andG. Diambrini Palazzi:Phys. Rev. Lett.,23, 718 (1969).
3. J. J. Sakurai:Proc. of the 1969 International Conference on Electron and Photon Interactions at High Energy, Liverpool (to be published).
4. T. D. Lee:Proc. of the Second Hawaii Topical Conference in Particle Physics (Honolulu, 1968), p. 13.
5. D. R. O. Morrison:Proc. Conference on High-Energy Two-Body Reaction (Stony Brook, N. Y., 1966).