1. M. A. Grigor’ev, Yu. A. Zyuryukin, V. V. Petrov, and A. V. Tolstikov, Izv. Vyssh. Uchebn. Zaved., Radiofiz. 23, 948 (1982).
2. M. A. Grigor’ev, V. V. Petrov, and A. V. Tolstikov, Izv. Vyssh. Uchebn. Zaved., Radiofiz. 28, 908 (1985).
3. M. A. Grigor’ev, V. V. Petrov, and A. V. Tolstikov, Izv. Vyssh. Uchebn. Zaved., Radiofiz. 28, 1053 (1985).
4. M. A. Grigor’ev and V. V. Petrov, in Proceedings of the International CLEO Conference, Baltimore, Maryland, 1991, p. 240.
5. M. A. Grigor’ev, V. V. Petrov, G. I. Pylaeva, and A. I. Mischenko, in Proceedings of the School-Seminar, Leningrad, 1990, pp. 513–518.