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2. L.M. Brekhovskikh, O.A. Godin, Acoustics of Layered Media II. Point Sources and Bounded Beams, Springer, Berlin, 1992.
3. C.C. Mei, The Applied Dynamics of Ocean Surface Waves, World Scientific, Singapore, 1989 (2nd reprint, 1994).
4. Extended refraction–diffraction equations for surface waves;Massel;Coastal Eng.,1993
5. The modified mild-slope equation;Chamberlain;J. Fluid Mech.,1995