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2. Stability of periodic waves of finite amplitude on the surface of a deep fluid;Zakharov;Sov. Phys. J. Appl. Mech. Tech. Phys.,1968
3. Wave instablities;Benney;Stud. Appl. Math.,1969
4. Transmission of stationary nonlinear optical pulses in dispersive dielectric fibers, I. Anomal dispersion;Hasegawa;Appl. Phys. Lett.,1973