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Electron BeamMagnetostatic WavesRectangular WaveguideMagnetic FieldElectromagnetic FieldExperimental DataFrequency CharacteristicsStatistical CharacteristicsElectric FieldElectromagnetic WaveRadiation PatternRadio WavesCross SectionRelativistic Electron BeamDirectivity PatternSurface Acoustic WavesWaveguideIntegral EquationFrequency Characteristica Relativistic Electron