1. V. A. Shkoda-Ul'yanov, In the Collection: Some Problems of Modern Physics of the Nucleus and Elementary Particles [in Russian], (L'vov, L'vov State University Press, 1957), p. 89.
2. V. A. Shkoda-Ul'yanov,Ibid In, p. 55.
3. Roberg, Nordheim, Phys. Rev.,75, 444 (1949).
4. Kantz, Hofstadter, Phys. Rev.,89, 607 (1953).
5. I. A. Grishaev, et al., Pribory i tekhnika éksperimenta,6, 132 (1962).