1. O. A. Val'dner et al., in: Accelerators [in Russian], No. 11, Atomizdat, Moscow (1969), p. 16.
2. O. A. Val'dner, Linear Electron Accelerators [in Russian], Atomizdat, Moscow (1966).
3. Electronic Ultrahigh-Frequency Crossed-Field Devices [Russian translation], Vol. 2, Izd-vo Inostr. Lit., Moscow (1961), p. 327.
4. V. F. Vikulov et al., in: Accelerators [in Russian], No. 9, Atomizdat, Moscow (1967), p. 66.
5. V. F. Gass et al., in: Accelerators [in Russian], No. 10, Atomizdat, Moscow (1968), p. 196.