1. W. R. Webber:Progress in Elementary Particle and Cosmic Ray Physics (Amsterdam, 1962) (edited byJ. G. Wilson andS. A. Wouthuysen), vol.6.
2. M. V. K. Appa Rao andM. F. Kaplon:Nuovo Cimento,27, 700 (1963).
3. V. Y. Rajopadhye andC. J. Waddington:Phil. Mag.,3, 25 (1956).
4. M. Rich andR. Madey:Range Energy Tables, University of California Radiation Laboratory Report UCRL-2301.
5. H. Aizu, Y. Fujimoto, S. Hasegawa, M. Koshiba, I. Mito, J. Nishimura andK. Yokoi:Prog. Theor. Phys. Suppl.,16, 54 (1960).