1. P. Ciok, T. Coghen, J. Gierula, R. Hołyński, A. Jurak, M. Miesowicz, T. Saniewska andO. Stanisz:Nuovo Cimento,8, 166 (1958); 10, 741 (1958);G. Cocconi:Phys. Rev.,111, 1699 (1958);K. Niu:Nuovo Cimento,10, 994 (1958).
2. A. P. Zhdanov, I. M. Kuks, N. Y. Skirda andR. M. Yakovley:Transactions of the International Conference on Cosmic-Rays, Vol.1 (Moscow, 1960), p. 87;J. Perneger, V. Pettzilka andV. Simak:Proceedings of the Cosmic Ray Conference, Vol.1 (Moscow, 1960), p. 127;A. Barkow, B. Chamany, D. Haskin, P. L. Jain, E. Lohrman, M. Teucher andM. Schein:Phys. Rev.,22, 617 (1961);
3. P. L. Jain:Nuovo Cimento,31, 764 (1964).
4. P. L. Jain:Experiments on high-energy Particle collisions, inAIP Conference Proceedings, No. 12 (1974), p. 141.
5. W. L. Kraushaar andL. J. Marks:Phys. Rev.,93, 326 (1954).