1. S. G. Rautian, Zh. Éksp. Teor. Fiz. 112, 836 (1997) [JETP 85, 451 (1997)].
2. N. G. Galkin, V. A. Margulis, and A. V. Shorokhov, Fiz. Tverd. Tela (St. Petersburg) 43, 511 (2001) [Phys. Solid State 43, 530 (2001)].
3. N. G. Galkin, V. A. Margulis, and A. V. Shorokhov, Fiz. Tverd. Tela (St. Petersburg) 44, 466 (2002) [Phys. Solid State 44, 486 (2005)].
4. M. I. Kaganov and I. M. Lifshits, Usp. Fiz. Nauk 129, 487 (1979) [Sov. Phys. Usp. 22, 904 (1979)].
5. V. A. Zatsepin, V. P. Smyslov, N. R. Sadykov, M. O. Sadykova, V. K. Filippov, and A. N. Shcherbina, Opt. Atmos. Okeana 20, 378 (2007) [Atmos. Ocean. Opt. 20, 340 (2007)].