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2. Thermionic Valves;Beck,1953
3. “Principles of velocity modulation,”;Fremlin;J. Inst. Elect. Engrs. (London),1946
4. “Design and performance of a high-power pulsed klystron,”;Chodorow;Proc. IRE,1953
5. “A study of the broadband frequency response of the multi-cavity Klystron amplifier,”;Kreuchen;J. Electron,1957