1. M. L. Ter-Mikaelyan, The Influence of the Medium on High-Energy Electromagnetic Processes (Akad. Nauk ARM SSR, Yerevan, 1969) [in Russian].
2. G. M. Garibyan and Yan Shi, Zh. Eksp. Teor. Fiz. 61, 930 (1971) [Sov. Phys. JETP 34, 595 (1971)].
3. V. G. Baryshevskii and I. D. Feranchuk, Zh. Eksp. Teor. Fiz. 61, 944 (1971) [Sov. Phys. JETP 34, 502 (1971)].
4. V. G. Baryshevskii and I. Ya. Dubovskaya, in Results of Science and Engineering, Ser. Beams of Charged Particles and Solid (VINITI, Moscow, 1991), Vol. 4, p. 129 [in Russian].
5. K.-H. Brenzinger, C. Herberg, B. Limburg, et al., Z. Phys. A 358, 107 (1997).