1. V.G. Baryshevsky, Dokl. Akad. Nauk BSSR 15, 306(1971).
2. V.G. Baryshevsky and I.D. Feranchuk, Zh. Eksp.Teor. Fiz. 61, 944(1971), (Sov. Phys. JETP 34, 50 (1972); addendum, ibid 64, 760 (1973)).
3. G.M. Garibyan and C. Yang, Zh. Eksp. Teor. Fiz. 61, 930(1971), (Sov. Phys. JETP 34, 495 (1972)).
4. G.M. Garibyan and C. Yang, Zh. Eksp. Teor. Fiz. 63, 1198(1972), (Sov. Phys. JETP 36, 631 (1973)).
5. M.L. Ter-Mikaelian, High Energy Electromagnetic Processes in Condensed Media, Wiley Interscience, New York, London, Sydney, Toronto, 1972.