1. M. Bloch, A. Lagarrigue, P. Rançon andA. Rousset:Rev. Sci. Instr.,32, 1302 (1961).
2. Ecole Polytechnique, CERN, Milano, Padova, Toiuno groups:Proc. Aixen-Provenee (Jonj., vol.1 (1961), p. 449.
3. See for instanceB. Rossi:High-Energy Particles (New York, 1952) p. 13.
4. R. G. Thomas jr.:Phys. Rev.,120, 1015 (1960);Wang Kang-Ch’ahg, Wang Ts’u-Chieng, Ting Ta-Ts’ao, V. G. Ivanov, Yu. V. Kattshev, E. N. Klanitskaya, L. A. Kulyukina, Nguyen Dinh Ty, A. V. Nikitin, S. Z. Otvinovskii, M. I. Solov’ev, R. Sosnovskii andM. D. Shafranov: zurn.Ėksp. Teor. Fiz.,38, 426 (1960).
5. Strange Particles Correlations in High-Energy Pion-Nucleon Collisions; Ecole Polytechnique, CERN, Torino, Padova groups:Proc. of the 1962 International Conference on High-Energy Physics, to be published.