1. Linear and Nonlinear Waves;Whitham,1974
2. A variational principle for a fluid with a free surface;Luke;J. Fluid Mech.,1967
3. A variational principle for nonlinear water waves;Debnath;Acta Mech.,1988
4. Nonlinear Water Waves;Debnath,1995
5. Geophysical Fluid Dynamics;Pedlosky,1979