1. J. H. Jeans, Phil. Trans. R. Soc. London, Ser. A 199, 1 (1902).
2. K. A. Postnov and A. V. Zasov, Course of General Astrophysics (Mosk. Gos. Univ., Moscow, 2005) [in Russian].
3. A. V. Gurevich, K. P. Zybin, and Yu. V. Medvedev, J. Exp. Theor. Phys. 77, 593 (1993).
4. A. V. Gurevich and K. P. Zybin, Phys. Usp. 38, 687 (1995).
5. S. N. Gurbatov, O. V. Rudenko, and A. I. Saichev, Waves and Structures in Nonlinear Media without Dispersion. Applications to Nonlinear Acoustics (Fizmatlit, Moscow, 2006) [in Russian].