1. L. A. Vainshtein, Electromagnetic Waves [in Russian], Radio i Svyaz, Moscow (1988).
2. L. A. Vainshtein, in: High-Power Electronics [in Russian], Nauka, Moscow, No. 4, 157 (1965).
3. Yu. M. Tsipenyuk, in: High-Power Electronics [in Russian], Nauka, Moscow, No. 4, 173 (1965).
4. E. L. Kosarev and Yu. M. Tsipenyuk, in: High-Power Electronics [in Russian], Nauka, Moscow, No. 5, 105 (1968).
5. A. L. Cullen, Electron. Lett., 6, No. 8, 243 (1970).