1. Stability of periodicwaves of finite amplitude on the surface of a deep fluid;Zakharov;J. Appl. Mech. Tech. Phys.,1968
2. Collapse of langmuir waves;Zakharov;Sov. Phys.—JETP,1972
3. Exact theory of two-dimensional self-focusing and one-dimensional self-modulation of waves in nonlinear media;Zakharov;Sov. Phys.—JETP,1972
4. G.P. Agrawal, Nonlinear Fiber Optics Academic, San Diego, 1989.
5. A. Hasegawa, Y. Kodama, Solitons in Optical Communications Clarendon, Oxford, 1995.