1. Yu. V. Polezhaev, V. P. Romanchenkov, I. V. Chirkov, and V. N. Shebeko, Inzh.-Fiz. Zh.,37, No. 3, 395?404 (1979).
2. Yu. V. Polezhaev, Inzh.-Fiz. Zh.,37, No. 3, 390?394 (1979).
3. Yu. A. Tadol'der, Tr. Tallin. Politekh. Inst. Ser. A, No. 223 (1966), pp. 3?13.
4. G. A. Frolov, V. V. Pasichnyi, Yu. V. Polezhaev, and A. V. Choba, Inzh.-Fiz. Zh.,52, No. 1, 33?37 (1987).
5. G. A. Frolov, A. A. Korol', V. V. Pasichnyi, et al., Inzh.-Fiz. Zh.,51, No. 6, 932?940 (1986).