1. V. A. Dulin, V. P. Mashkovich, et al., “Atomnaya Énergiya,”9, 4, 318 (1960).
2. E. Aleksandrovich and M. Bartenbakh, “Atomnaya Énergiya,”8, 5, 451 (1960).
3. Fizika tverdogo tela.1, 9, 1381 (1959).
4. Phys. Rev.98, 6, 1742 (1955); Phys. Rev.99, 4, 1171 (1955).
5. Uspekhi fiz. nauk.50, 1, 51 (1953).