1. N. G. Mordasov, Zh. Tekh. Fiz. 73(2), 107 (2003) [Tech. Phys. 48, 239 (2003)].
2. N. G. Mordasov, Vopr. At. Nauki Tekh., Ser.: Fiz. Radiats. Vozd. Radioélektron. Apparaturu, Nos. 3–4, 56 (2002).
3. V. P. Kovalev, Secondary Radiation of Electron Accelerators (Atomizdat, Moscow, 1979) [in Russian].
4. H. Tseng and R. Pratt, Phys. Rev. A 19, 1525 (1979).
5. L. Schiff, Phys. Rev. 83, 252 (1951).