1. Landau L. D. andPomeranchuk I. Ya.,Dokl. Akad. Nauk SSSR,102 (1955) 489;Fradkin E. S.,Zh. Eksp. Teor. Fiz.,28 (1955) 750.
2. Quantum Electrodynamics Phenomena in the Intense Field, Proceedings of the P. N. Lebedev Physical Institute, Vol. 111 (Nauka, Moscow) 1979 [in Russian].
3. The Problems of Quantum Electrodynamics with the Intense Field, Proceedings of the P. N. Lebedev Physical Institute, Vol.168 (Nauka, Moscow) 1986 [in Russian].
4. Polarization Effects in External Gauge Fields, Proceedings of the P.N. Lebedev Physical Institute, Vol.192 (Nauka, Moscow) 1988 [in Russian].
5. Migdal A. B.,Zh. Eksp. Teor. Fiz.,62 (1972) 1621.