1. Ph. Parzen, J. Appl. Phys. 32, 2484 (1961).
2. V. A. Balakirev, V. A. Buts, and V. I. Kurilko, Zh. Tekh. Fiz. 46, 477 (1976) [Sov. Phys. Tech. Phys. 21, 272 (1976)].
3. V. A. Balakirev and G. L. Sidel’nikov, “Transition radiation of modulated electron beams in an inhomogeneous plasma” [in Russian], Preprint, Khar’kov Physicotechnical Institute (1994), p. 104.
4. L. D. Landau and E. M. Lifshitz, The Classical Theory of Fields, 4th ed., Pergamon, New York (1975) [Russ. original, Moscow (1948)].