1. F. Calogero andA. De Gasperis:Spectral Transform and Solitons, Tools to Solve and Investigate Non-linear Evolution Equation, Vol. 1 (North-Holland, Amsterdam, 1982).
2. Fisica Teorica;L. D. Landau,1984
3. V. Artale, D. Levi, S. Marullo andL. Santoleri:J. Geophys. Res. C,95, 16065 (1990).
4. S. Pierini:J. Phys. Ocean.,19, 6, 755 (1989).
5. J. S. Russel:Report on Waves (Murray, London, 1844).