1. H. Benner, R. Henn, F. Roedelsperger et al., Izv. Vyssh. Uchebn. Zaved. PND 3, No. 1, pp. 32–50 (1995).
2. A. I. Smirnov, Zh. Éksp. Teor. Fiz. 90, 385 (1986) [Sov. Phys. JETP 63, 222 (1986)].
3. A. M. Mednikov, Fiz. Tverd. Tela (Leningrad) 23(1), 242 (1981) [Sov. Phys. Solid State 23, 136 (1981)].
4. V. E. Demidov and N. G. Kovshikov, JETP Lett. 96, 261 (1997).
5. B. A. Kalinikos, N. G. Kovshikov, and A. N. Slavin, Zh. Éksp. Teor. Fiz. 94(2), 159 (1988) [Sov. Phys. JETP 67, 303 (1988)].