1. Lehrbuch der Drahtlosen Telegraphie;Zenneck,1925
2. A New Method to Increase Efficiency of the Radio Broadcasting Station (in Russian);Fomichev;Elektrosvyaz,1938
3. Power-Tube Performance in Class C Amplifiers and Frequency Multipliers as Influenced by Harmonic Voltage;Sarbacher,1943
4. High-Frequency Amplifier;Royden,1950
5. Wireless Telegraph and Telephone Transmission;Round,1925