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2. Longuet-Higgins, M. S. and Stewart, R. W. Radiation stress and mass transport in gravity waves with applications to surf-beats, J. Fl. Mech. 13, 481–504
3. Long period oscillations of moored ships subject to short-wave seas;Bowers;Trans. RINA,1976
4. Short and long wave directional spectra;Sand,1981
5. On the generation of long-period second-order free-waves due to changes in the bottom profile;Molin,1982