1. K. J. Foley, R. S. Gilmore, R. S. Jones, S. J. Llndenbaum, W. A. Love, S. Ozaki, E. H. Willen, R. Yamada, andL. C. L. Yuan: paper presented to theConference on High-Energy Physics (Dubna, U.S.S.E., 1964).
2. G. Bellettini,et al.: paper presented to theConference on High-Energy Physics (Dubna, U.S.S.R., 1964).
3. N. N. Khuri andT. Kinoshita: to be published.
4. S. Mandelstam:Nuovo Cimento,30, 1127, 1148 (1963).
5. S. D. Drell:Proceedings of the International Conference on High-Energy Nuclear Physics (CERN, 1962), p. 897.