1. M. Grillakis, J. Shatah, W. Strauss. Stability Theory of Solitary Waves in the Presence of Symmetry I.J. Funct. Anal., 1987, 74: 160–197
2. M. Grillakis, J. Shatah, W. Strauss. Stability Theory of Solitary Waves in the Presence of Symmetry II.J. Funct. Anal., 1990, 94: 308–348
3. Guo Boling. Global Smooth Solution for the System of Zakharov Equations in Nonhomogeneous Medium.Northeastern Math. J., 1990, 6: 379–390
4. T. Ozawa, K. Tsutaya, Y. Tsutsumi. Normal Form and Global Solutions for the Klein-Gordon-Zakharov Equation. University of Tokyo, 1994.
5. S.G. Thornhill, Dter Haar. Langmuir Turbulence and Modulational Instability.Phys. Reports (Sect. C of Phys. Lett), 1978, 43: 43–99