1. O. A. Kolpakov and V. I. Kotov, Zh. Tekh. Fiz. 34, 1387 (1964) [Sov. Phys. Tech. Phys. 9, 1072 (1964)].
2. L. N. Kazanskii, A. V. Kisletsov, and A. N. Lebedev, At. Energ. 30, 27 (1971).
3. I. A. Grishaev, A. N. Dedik, V. V. Zakutin, et al., Zh. Tekh. Fiz. 44, 1743 (1974) [Sov. Phys. Tech. Phys. 19, 1087 (1974)].
4. V. A. Vishnyakov, V. V. Zakutin, V. A. Kushnir, et al., Zh. Tekh. Fiz. 57, 1549 (1987) [Sov. Phys. Tech. Phys. 32, 924 (1987)].
5. S. Y. Park and J. L. Hirshfield, Phys. Rev. E 62, 1266 (2000).