1. J. R. Pierce, Traveling-Wave Tubes (Van Nostrand, New York, 1950; Sovetskoe Radio, Moscow, 1952).
2. L. N. Loshakov, Zh. Tekh. Fiz. 26, 809 (1956).
3. L. A. Vainshtein and V. A. Solntsev, Lectures on Microwave Electronics (Sovetskoe Radio, Moscow, 1973) [in Russian].
4. L. N. Loshakov, Radiotekh. Elektron. (Moscow) 3, 461 (1957).
5. M. F. Stel’makh, Radiotekh. Elektron. (Moscow) 3, 470 (1957).