1. M. I. Kaganov, R. E. Kucherov, and L. E. Rikenglaz, Zh. Tekh. Fiz. 31, 588 (1961) [Sov. Phys. Tech. Phys. 6, 420 (1961)].
2. I. G. Gverdtsiteli, V. Ya. Karakhanov, E. A. Kashirskii, et al., Zh. Tekh. Fiz. 42, 103 (1972) [Sov. Phys. Tech. Phys. 17, 78 (1972)].
3. V. I. Babanin, I. N. Kolyshkin, V. I. Kuznetsov, et al., Zh. Tekh. Fiz. 52, 1304 (1982) [Sov. Phys. Tech. Phys. 27, 793 (1982)].
4. S. Iizuka, P. Michelsen, J. J. Rasmussen, et al., J. Phys. Soc. Jpn. 54, 2516 (1985).
5. V. I. Kuznetsov and A. Ya. Ender, Zh. Tekh. Fiz. 47, 2237 (1977) [Sov. Phys. Tech. Phys. 22, 1295 (1977)].