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2. B. R. Sutherland, Internal Gravity Waves (Cambridge Univ. Press, Cambridge, 2010).
3. V. V. Bulatov and Yu. V. Vladimirov, Dynamics of Nonharmonic Wave Packets in Stratified Fluids (Nauka, Moscow, 2010) [in Russian].
4. V. V. Bulatov and Yu. V. Vladimirov, Wave Dynamics of Stratified Mediums (Nauka, Moscow, 2012) [in Russian].
5. V. V. Bulatov and Yu. V. Vladimirov, Waves in Stratified Fluids (Nauka, Moscow, 2015) [in Russian].