1. W. E. Humphrey andR. R. Ross:Phys. Rev.,127, 1305 (1962).
2. O. Dahl, N. Horwitz, D. H. Miller, J. J. Murray andM. Watson:Proceedings of the International Conference on High-Energy Physics (Rochester, 1960), p. 415.
3. Helium Bubble Chamber Collaboration:Proceedings of the International Conference on High-Energy Physics (CERN, 1960), p. 426.
4. K − Collaboration:Nuovo Cimento,13, 690 (1959).
5. K − Collaboration:Nuovo Cimento,14, 315 (1959).