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2. The propagation of nonlinear wave envelopes;Benney;J. Math. and Phys.,1967
3. On three-dimensional packets of surface waves;Davey;Proc. R. Soc.,1974
4. The modulation and stability of an internal gravity wave;Grimshaw;Mem Soc. R. Sci. Liège,1976
5. the excitation of resonant triads by single internal waves;Martin;J. Fluid Mech.,1972