1. A. A. Sokolov and I. M. Ternov, Synchrotron Radiation [in Russian], Nauka, Moscow (1966).
2. A. A. Sokolov and I. M. Ternov, Relativistic Electron [in Russian], Nauka, Moscow (1974).
3. V. I. Ritus, Trudy Fiz. Inst. Akad. Nauk SSSR, 111, 152 (1979).
4. A. I. Nikishov, Trudy Fiz. Inst. Akad. Nauk SSSR, 111, 5 (1979).
5. W. H. Furry, Phys. Rev., 81, 115 (1951).