1. L. W. Alvarez, H. Bradner, P. Falk-Vairant, J. D. Gow, A. H. Rosenfeld, F. T. Solmitz etR. D. Tripp:Nuovo Cimento,5, 1026 (1957).
2. W. Chupp, G. Goldhaber, S. Goldhaber etF. H. Webb:Phys. Rev.,100, 959 (1955);W. F. Fey, J. Schneps, G. A. Snow etM. S. Swami:Phye. Rev.,100, 950, 1449 (1955);E. P. George, A. J. Herz, J. H. Noon etN. Solntseff:Nuovo Cimento,3, 94 (1956);J. Hornbostel etE. O. Salant:Phys. Rev.,102, 502 (1956);D. M. Fouenet etM. Widgoff:Phys. Rev.,102, 929 (1956);D. M. Haskin, T. Bowen etM. Schein:Phys. Rev.,103, 1512 (1956);W. H. Barkas, W. F. Dudziak, P. C. Giles, H. H. Heckman, W. F. Inman, C. J. Mason, N. A. Nickols etF. M. Smith:Phys. Rev.,105, 1417 (1957).
3. Washington group » et de la présente collaboration ;Proceedings of the Seventh Annual Bochester Conference (New York, 1957).
4. L. W. Alvarez:Proceedings of the Seventh Annual Rochester Conference (New York, 1957).
5. F. C. Gilbert, C. E. Violet etR. S. White:Phys. Rev.,107, 228 (1957).