1. K. P. Aref'ev, S. A. Vorob'ev, and E. P. Prokop'ev, Izv. Vyssh. Uchebn. Zaved., Fiz., No. 10, 76 (1974).
2. K. P. Aref'ev and G. I. étin, Paper deposited at VINITI, No. 2523-76 (1976).
3. E. P. Prokop'ev, Abstracts of Proceedings of Third All-Union Conference on Radiation Physics and Chemistry of Ionic Crystals [in Russian], Salaspils (1975), p. 271.
4. E. P. Prokop'ev, in: Quantum Properties of Atoms and Ions and Positron Diagnostics [in Russian], Izd. Fan, Tashkent (1975).
5. E. P. Prokop'ev, TsNII, ?élektronika,? deposited papers DE-1452-1457 (1975); deposited paper Dé-1664 (1976);