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English TranslationSoviet PhysicsSound FieldSound ScatteringAcoustic WaveUnderwater Sound ChannelAcoustic RadiationSound RadiationExperimental StudyOceanic WaveguideSound WavesFrequency DependenceReflection Coefficientin WaterField StructureCylindrical ShellAcoustic TomographyUltrasonic WavesPoint SourceSurface Acoustic Waves