1. S. A. Korneichuk and S. V. Konyushko, Russ.Phys. J., 53, No. 11, 1125–1130 (2011).
2. V. I. Gvozdev and E. I. Nefedov, Volumetric Microwave Integrated Circuits [in Russian], Nauka, Moscow, 1985.
3. Yu. K. Pozhela, Plasma and Current Instabilities in Semiconductors [in Russian], Nauka, Moscow, 1977.
4. N. N. Beletski and V. M. Yakovenko, Solid State Commun., 34, (1980).
5. I. E. Tamm, Fundamentals of the Theory of Electricity [in Russian], Moscow, 1957.