1. P. M. Morozov, B. N. Makov, and M. S. Ioffe, J. Atomic Energy (USSR) 2, 272 (1957).
2. Iu. V. Adamchuk, V. F. Gerasimov, B. V. Efimov, V. S. Zenkevich, V. I. Mostovoi, M. I. Pevzner, A. P. Tsitovich, and A. A. Chernyshov, ?Physical research,? Reports of the Soviet Delegation at the International Conference on the Peaceful Uses of Atomic Energy [in Russian] (Izd AN SSSR, 1955), p. 86.
3. S. A. Baranov et al., J. Exptl.-Theoret. Phys. (USSR) 30, 225 (1956).