1. A. N. Gorbunov, Trudy FIAN, 13: 174 (1960).
2. J. F. Wright, D. Morrison, J. Reid, and J. Atkinson, Proc. Phys. Soc., A69: 77 (1956).
3. A. T Varfolomeev and A. N. Gorbunov, Zh. Eksperim. i Teor. Fiz., 47: 30 (1964).
4. V. A. Petukhov, A A. Komar, and M. N. Yakimenko, The Compton Effect and the Limits of Applicability of Quantum Electrodynamics, Preprint of the Joint Institute of Nuclear Research, R-383 (1959).
5. J M. Sellen, G. Cocconi, V. T. Cocconi, and E. Hart, Phys. Rev., 113:1323 (1959); 115: 678 (1960).