1. N. Bohr, The Penetration of Atomic Particles through Matter, Hafner, New York (1948).
2. P. Mulas and R. Axtmann, Phys. Rev.,146, 296 (1966).
3. F. Nasyrov and S. V. Linev, Atomnaya Énergiya,20, 464 (1966).
4. J. Lindhard and M. Scharff, Phys. Rev.,124, 128 (1961).
5. J. Lindhard et al., Kgl. Danske Vid. Selskab. Mat.-Fus. Medd.,33, 14 (1963).