1. K. L. Brown et al., RSI,27, No. 9 (1956), p. 696.
2. A. M. Parlag, D. N. Sikora et al., ?Electronic accelerators.? Transactions of the III International Conference, Tomsk (1961).
3. I. A. Grishaev et al., PTE, No. 6 (1962).
4. A. Kautz et al., ?Nucleonics,?12, No. 3 (1954), p. 36.
5. N. G. Afanas'ev and A. V. Dem'yanov, PTé, No. 2 (1962).