1. Space-Charge Waves;Beck,1958
2. Small-signal theory of velocity modulated electron beams;Hahn;Gen. Elec. Rev.,1939
3. Wave energy and transconductance of velocity-modulated electron beams;Hahn;Gen. Elec. Rev.,1939
4. Velocity modulated tubes;Hahn;Proc. IRE,1939
5. Klystrons and Microwave Triodes;Hamilton,1948