1. A. Chenevas-Paule, J. Phys. (Paris) 37, 4 (1976).
2. V. N. Andreev, A. G. Aronov, and F. A. Chudnovskii, Zh. Éksp. Teor. Fiz. 61, 705 (1971) [Sov. Phys. JETP 34, 376 (1972)].
3. V. V. Mokrousov and V. N. Kornetov, Fiz. Tverd. Tela (Leningrad) 16(10), 3106 (1974) [Sov. Phys. Solid State 16, 2005 (1974)].
4. I. V. Krive and A. S. Rozhavskii, Zh. Éksp. Teor. Fiz. 81(5), 1811 (1981) [Sov. Phys. JETP 54, 959 (1981)].
5. A. L. Pergament, G. B. Stefanovich, and F. A. Chudnovskii, Fiz. Tverd. Tela (St. Petersburg) 36(10), 2988 (1994) [Phys. Solid State 36, 1590 (1994)].