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3. C. C. Mei, The Applied Dynamics of Ocean Surface Waves (World Sci., Singapore, 1989).
4. V. P. Maslov, Perturbation Theory and Asymptotic Methods (Izd. Moskov. Univ., Moscow, 1965) [in Russian].
5. V. P. Maslov and M. V. Fedoryuk, Semiclassical Approximation for Equations of Quantum Mechanics (Nauka, Moscow, 1976) [in Russian].